JJ vs. 3 LAGs on monotone flop

[SlantNGo]

MP1 was LA-A, quite aggressive after the flop, but only about 8% PFR over 30 hands.
MP3 was LA-A, 35% PFR over 30 hands, not quite as aggressive as MP1 after the flop.
SB was LA-P, goes to the river way too much w/ weak draws, sees lots of showdowns w/ 2nd and 3rd best hands. Basically a fish who raises pre-flop more often.

Note: None of the 3 were maniacal. MP1 justs hit the raise button too often when they have a piece of the board. MP3 raises way too much preflop, but doesn't get into too many raising wars after the flop.

Party Poker 0.5/1 Hold'em (9 handed) converter

Preflop: Hero is UTG+1 with J[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, MP1 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">MP3 3-bets</font>, <font color="#666666">2 folds</font>, SB calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero caps</font>, MP1 calls, MP3 calls, SB calls.

Flop: (17 SB) K[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP1 raises</font>, MP3 calls, SB calls, Hero calls.

Turn: (12.50 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero checks, <font color="#CC3333">MP1 bets</font>, <font color="#CC3333">MP3 raises</font>, SB calls, Hero calls, <font color="#CC3333">MP1 3-bets</font>, MP3 calls, SB calls, Hero calls.

I think I should fold on the turn here when it's 2 back to me. I had a lapse of attention (action at other table) and called thinking I was closing the action.

River: (24.50 BB) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero checks, MP1 checks, MP3 checks.

Final Pot: 24.50 BB

My main question is what I should be doing on this flop.