Look, if they wanted Sweet dead - they would've shot him up. He won't be in jail then, he would've been dead in the war with the ballas.
So probably yes, they was going for HIS mom to heat things up between GSF and ballas. A famous quote from last 2 GTA's:
"nothing makes better than a well organised gangwar" or something close 2 that... basicly, what Tenpenny wanted is to get things 'tween the gangs heated really good and then he put that on smoke and ryder too - 2 mess up the relation ship in the crew.
He's a corrupt cop
BTW, use spoiler tags next time