It would depend on how exactly they made the bad situation for the parent... did it amount to forcing them into a situation, or was it just an attendant consequence of a decision the non-custodial child had every right to make? Was it something the parent consented to? If force was used, with no consent, damn right the child violated the parent's rights, and should have to make it right. If no force, it wouldn't be right to force the child to make things right, but it might be a moral obligation. Hard to say without more specifics. As for the promise of support, I would think just a general sense of honor and keeping one's word would require following through with that. It is especially bad if the parents did some things in reliance on that support being there... but I don't think anyone should be forced to make good on a promise to give something in the future, when they didn't actually convey rights to the property yet. But if the child said "I hereby give you x number of dollars for the rest of your life" and the parent says "I accept," that is a transfer of property rights and the child should be forced to relinquish the property if he holds out.
I honestly got lost at the difference between keeping a promise and a transfer of property rights, I'm guessing it's the "I give" as opposed to "I will give".
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