you ask for exactly what you want in the petition.....you don't worry about what he MAY do, you deal with that IF it comes to pass.
i am a bit concerned about your living arrangements....the home is owned by your IN LAWS, aka HIS parents. while to date that may seem to work out just fine and that they have your back.....we have way too many sad tales on this forum of moms who suddenly find themselves displaced and left out in the cold when the alcoholic's family circles the wagons. unless you have an ironclad lease in writing spelling out the specifics of your guaranteed length of stay, i'd not consider that a done deal. i don't care what they have SAID......have a solid plan B.
while you don't have to have it all figured out today, i would urge you to pick up the pace a bit. as you said, things have already happened that you NEVER thought possible....and i would not be surprised if there is even more that will be revealed.
just call me the Pixie of Happiness here....sigh.