live 10/20, AA hand

[earlytimes1]

soft Sunday afternoon 10/20 at Taj.

Here raises AdAh UTG, UTG+1 (loose, passive, bad) calls, MP2 (passive, uncreative) calls, BB (quite possibly retarded) calls.

flop (9sb) Ac 5c 4
I bet, UTG+1 and MP2 call.

turn (6 bb) Ac 5c 4d 6s
I bet, UTG+1 raises, MP2 calls two, I ...

easy 3-bet, right? I hadn't seen UTG+1 raise a big street without a very big hand, but the host of possible hands I beat (44-66, two pairs, etc.) plus the wanting to charge MP2 for likely draw make this a 3-bet, and call-down to cap UI, right?

sorry if standard, just need a quick check-up.