The size of this game was actually quite high but I am not quite sure whether this is that complicated a hand.

Game is live action, 120bb effective.

MP limps: a limpy live who can limp crap, but also trap from time to time limps.
CO opens to 4x: He is a looser old man pro who can make huge bluffs, but showdowny with made hands.     HJ 3bets to 12x: I've yet to see him 3bet in 7hrs live play, he is very loose and limpy preflop I'd usually expect him to call with hands as strong as TT, possibly JJ also. He likely holds JJ+,AK+, maybe AQ,TT. I am sure anyone who has played high stakes live is familiar with this kind of player, he is also winning, so a very low chance of the passive player 'blow-up'.

I have KcKs in the SB.

I can call, MP may fold but CO probably won't.
4bet to 30x or so and then strongly consider folding to his jam.
4bet to 45x or so and tie his very strong range into stacking off on almost all boards. ie he will call his JJ+ and stack off on the flop for 1PSB.

If I elect to 4bet, can I fold to a jam? If I am considering folding to his jam an option and he is likely passive on later streets. Is it better to call and play poker?

Any and all feedback is appreciated.