Jaysus!
When I uprooted my kids to move to Norway to look after my own elderly parents (dad in wheelchair after a stroke and mum with levy body dementia) I was called a blooming saint, and this was for looking after MY OWN parents.
The mistake here is not thinking through the consequences prior to leaving (hey, neither did we and we are still frantically trying to clear up the mess we made of things by moving! The financial loss to our own immediate family has been tremendous
)
AND expecting any financial reward.
No, it is never a good idea to move in with elderly parents, you may have a heart of gold, but in the cold light of day, nobody will thank you for it.
And why is this? Because nobody is going to recognize your good deed, and nobody is going to reward you, if it means giving up on something themselves.
Good and decent people give up a lot to help others. People who wont do the same, are equally as unlikely to recognize neither the financial benefit THEY have from it, nor grant any benefit to you for doing so.
At the end of the day, when the will is read out, no sibling is going to say "but hang on, sibling x has given up so much, lets allocate some more to them". They just arent. And why not? Because of greed and lack of empathy.
You can be sure as heck that the person who has NOT gone to live with elderly parents, is not going to be the person who will voluntarily give up on anything that is legally or rightfully theirs, even though it would be morally right to do so.