I would say that is the classy way of building character attachment. I like scenes in movies or games like that.
However, this is a R* game. I want an old timey whorehouse with poker games and bar fights. Walk into the wrong room and enjoy a silly interaction.
I don't want to watch pixels doing the deed per se, but owning a brother to make more money for my posse would be nice. Besides, F13 single player challenges satiated that curiosity.