Yes you are right. If your partner is on the loan then when she applies with her parents in the future most banks will assess her as making payments on the full loan that you have with your parents even though she is only responsible for a part of it.
That being said some of our lenders have a "common debt reducer" policy which allows her to provide evidence that she is not paying the full loan. Payslips from you and income evidence from your parents (if applicable) can be provided which then prove she is not paying the full debt on her own.
The lender would then assess:
- Her share of the home loan only e.g. 1/4 or 1/3 of the actual payments.
- Exclude your parents and your living expenses e.g. she is not paying your day to day expenses
- Children's living expenses may be included at 100%
Feel free to call us on 1300 889 743 and one of our brokers can assist you further. I think we should do a full assessment based on the proposed situation in 5 years just to be sure.