I want a prenup strictly towards my government retirement
Why do you want a prenup strictly towards your retirement?
I want my brother-in-law to have them
It is good to protect your assets. You should get a lawyer to help with the transfer because it might not be legal.
I just want to mess with my brother and raise his hopes. I don't really mean it.
That seems really rude. You shouldn't mess with your brother when it comes to money. It could damage your relationship.