Blood is thicker than water.
Hmmmmm... if you say so.
I have not heard a single Mexican sperm donor or recipient, who when about to be deported with the litter, argue that the "family" must stay together, as the are bussed off to Meh-ji-co.
That's not a rewarding way to game our pathetic immigration system (according our incompetent judiciary.)
So no, blood is not thicker etc....