"who kills grievous?"
Obi-Wan
"he is a jedi/sith?"
have not gotta clue, but hes definatley not a sith😉
"why he have lightsabers?"
😂 sorry u sound like a 5 year old😂 no offense. i dunno, go and ask him
"he know the force?"
correction: "does he know the ways of the force?" maybe😛