alright, a river range question of sorts

[bugstud]

online 50/1. running mostly 4 handed at the time.

UTG folds, I open {something} from the button, sb folds bb calls.

bb here is someone I don't recognize, thus far seems to play ok but I'm obv not 100% on that. He's playin someone hu elsewhere that indicates that game selection may not be his forte.

anyways, onto the flop. T87 2 hearts, I think T&7. He checks and I decide to check behind.

Turn 3h, he bets, I raise, he 3 towns and I capped.


River 4x, he bets. What minimum hand do I need here to raise, and what kinda range can we put him on at this point?