There are many different ways to leave a home to your children, transfer on death affidavit, will or trust. I would need more information regarding the "subsidy" to address that issue and suggest the best method to use.
You should make a will leaving the house to your daughters (and making dispositions of your other property). They will have to pay the loan and any subsidy, if by its terms it is repayable after you pass away.
It probably would be best to speak with an attorney who handles estates and trusts. Bring all the paperwork on the subsidy. If you make them joint tenants with you the payment might become due and there is no stepped up basis. There are several issues to consider so we can not answer without knowing more details.
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