Yeah, there's posts on facebook about it. Feel free to dig back in Momma Gags' timeline if you like (and lemme tell you it's mind numbing, she posts a LOT of old people meme reblog sort of things, so it's very slow going), but she and Papa Gags have full legal custody of the nephew and she's made angry noises before about Steve/addictbrother's shortcomings. There actually is an addict brother, it's just a question of the actual current situation.
Personally, I'm quite sure that he's not living in the house, and I had a convo with
@Iron Hamster a while back to that effect. His brother doesn't use Facebook a whole lot but Momma Gags does, and hasn't mentioned him in quite some time.
Edit: well, after some further digging on facebook, there continues to be absolutely no mention of him on Momma Gags page, but I did find THIS on his other facebook account.
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Could mean that he's currently in the house and planning to move out in the immediate future, but given no mentions or photos from Momma and Lou not bitching about him 24/7 I'm assuming the dude is living outside the house somewhere and is just having to change places. He mentions rent so sounds like he's actually gainfully employed too.