Help: parents' i-485, wrong birthdate of son's

ad-hoc

Registered Users (C)
a friend (us citizen) is sponsoring his parents, they are filing i-485. they have two sons here in the states. However, my friends' sibling (the other son)'s birthdate is wrong on his passport (he is not a citizen) which he never bother to correct it. So the question is:

if on their i-485, they put the correct birthdate, would the INS actually go check his son's records and causing trouble for his son? because of this concern, they are now thinking about not going through the process, which is agonizing my friend

I know they can simply not putting the other son on i-485 (which i think ins has no way of checking), but that's illegal, and they don't want to do that.

are there any legal way to get around or fix this problem?

thanks.
 
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