I'm pretty sure that Gillenormand's general attitude is "HERE'S WHAT I'M GONNA DO, other people can sort out the petty logistical details." Someone who knew their inheritance law and was willing to argue toe-to-toe with him could probably point out when what he was proposing was totally impossible -- or even persuade him it was impossible when it wasn't, if they played their cards right -- but I don't think Georges is in a position to do that on this particular subject, unfortunately.