Family relationships
Sharing the Cost of Caring for Aging Parents Among Siblings Without Conflict
Three models for splitting the cost of caring for aging parents (equal, proportional to income, proportional to time) plus how to record expenses so everything stays transparent and conflict-free.
Updated 9 November 2026 · FamConnect
Caring for a sick or elderly parent often stirs up tension among siblings. Monthly costs can balloon, while time and effort are not distributed evenly. Without a clear agreement, feelings of unfairness easily arise.
This guide covers three cost-sharing models you can choose from: equal, proportional to income, and proportional to time. You will also find ways to record expenses so everything stays transparent, plus sample numbers and practical steps.
Why agree on cost-sharing from the start?
The cost of caring for aging parents can include both routine and emergency expenses. Routine examples: medicine, milk, diapers, caregiver services, transportation to the hospital. Emergency examples: hospitalization or medical procedures. Without an agreement, one sibling may end up bearing more and resentment can build.
Beyond money, there is an invisible burden of time and effort. Accompanying a parent to checkups, staying up at night, handling paperwork, or cooking special meals. This burden also needs to be counted so no one feels shortchanged.
Model 1: Equal split
The simplest model: total costs divided by the number of siblings sharing the burden. The assumption is that all siblings have comparable financial capacity and their time contributions are considered equal. This model works if the income gap between siblings is not too large.
Example: monthly care costs of Rp4.500.000 for three siblings. Each person bears Rp1.500.000 per month. If there is an emergency cost, such as Rp12.000.000 for hospitalization, it is split three ways into Rp4.000.000 per person.
The downside of this model: siblings with much lower incomes may find it heavy. Conversely, the sibling who spends more time accompanying the parent may feel their contribution is not counted. Discuss openly before deciding.
Model 2: Proportional to income
This model splits costs according to each sibling's share of income. The goal is a fairer burden, since those earning more bear more. You need honest monthly income data agreed upon together.
The formula: each sibling's share = (sibling's income / total income of all siblings) x total cost. Example: three siblings with monthly incomes of Rp5.000.000, Rp8.000.000, and Rp12.000.000. Total Rp25.000.000. Care costs Rp4.500.000.
So the shares are: sibling A 20% x Rp4.500.000 = Rp900.000; sibling B 32% x Rp4.500.000 = Rp1.440.000; sibling C 48% x Rp4.500.000 = Rp2.160.000. This model is fairer financially, but it can cause embarrassment for those with lower incomes.
It is best to also agree on whether the income counted is gross income or income after deducting debt installments. Use the same definition for all siblings to avoid debate.
Model 3: Proportional to time
This model values contributions of time and effort. The sibling who provides more direct care can bear less of the cost, or even no money at all but instead contribute services. This model works if one sibling lives close to the parent and takes on the main caregiver role.
The method: calculate the value of the time given. For example, the rate for home caregiver services is Rp150.000 per day. If sibling A provides care for 15 days per month, the value of their contribution is Rp2.250.000. This value is subtracted from the total cost before splitting, or counted as a reduction of their money share.
Example: total cost Rp4.500.000. Sibling A provides care for 15 days (value Rp2.250.000). The remaining cost of Rp2.250.000 is split equally or proportional to income between siblings B and C. This model requires agreement on a reasonable per-day rate that does not keep changing.
How to record expenses so everything stays transparent
Whichever model you choose, record-keeping is key. Create a shared cash book or spreadsheet that all siblings can access. Record the date, description, amount, and who paid. Keep proof such as receipts or photos of receipts.
Set a recap period, for example at the end of each month. In the recap, calculate total expenses, each person's share, and the balance owed or overpaid. If someone has already paid more, the other siblings can reimburse them according to their shares.
- 1Create a shared spreadsheet with columns: date, description, amount, payer, and proof.
- 2Agree on the cost-sharing model (equal, proportional to income, or proportional to time).
- 3Set a recap period, for example on the 1st of each month or at the end of the month.
- 4Calculate total expenses and each sibling's share.
- 5Determine the balance: who needs to reimburse and how much.
- 6Make the settlement transfers within 7 days after the recap.
- 7Store the monthly recaps in a cloud folder so everyone can access them.
For emergency costs, create a shared reserve fund. For example, each sibling deposits Rp500.000 per month into a joint account. This fund is only used for urgent needs after agreement. Transparency prevents suspicion.
Tips for keeping relationships healthy
- Hold regular family meetings (for example every 3 months) to discuss costs and your parent's condition.
- Listen to everyone's objections before deciding on a model. Do not force one model if someone objects.
- Keep money discussions separate from emotions. Focus on numbers and agreements, not on who loves the parent most.
- If needed, appoint one financial coordinator to manage record-keeping and recaps.
- Remember that contributions are not always money; time and effort also count.
If conflict heats up, consider involving a neutral party such as a family counselor or mediator. They can help facilitate an agreement without taking sides.
Sample simulation with three models
| Model | Basis of split | Sample result for costs of Rp4.500.000 |
|---|---|---|
| Equal | Divided equally | Three siblings: Rp1.500.000 per person |
| Proportional to income | According to income share | A (20%): Rp900.000; B (32%): Rp1.440.000; C (48%): Rp2.160.000 |
| Proportional to time | Value of caregiving time is deducted | A provides care for 15 days (value Rp2.250.000); the remaining Rp2.250.000 is split between B and C |
Choose the model that best fits your family's situation. No model is perfect; what matters is agreement and openness. You can combine models, for example proportional to income for routine costs and proportional to time for reimbursing caregiver services.
Estimate your parent's care funding needs with the hospital cost calculator to get a rough figure for procedures or hospitalization.
Calculate hospital costsFrequently asked questions
What if a sibling does not want to share the burden?
Talk it over calmly to understand their reasons. There may be financial difficulties or disagreement with the model. If they still refuse, agree together on the consequences, such as inheritance rights or family relationships, without shutting out the parent. Focus on solutions, not blame.
Can care costs be charged against the inheritance?
In practice, some families use the inheritance as a source of care funding. However, inheritance rules vary and should be discussed with a legal expert. This guide does not cover the legal details of inheritance.
How do you handle sudden emergency costs?
Create a shared reserve fund from the start. Agree on the monthly deposit amount and the conditions for using it. If the fund is not enough, emergency costs can be split according to the chosen model, or covered by a joint loan that is clearly recorded.
Is a written agreement necessary?
A written agreement is not mandatory, but it helps a lot. Write down the agreed cost-sharing model, recap period, and settlement method. Sign it together and keep a copy. This reduces misunderstandings later on.
This guide is general in nature and is not legal or personal financial advice. Every family has different circumstances. Consult a qualified professional for important decisions.