MIL and Twins

I am 10w3d pregnant with twins. My husband talks about maybe having his mom move in with us. when she visits, we get along. The longest visit was 5 days. Those two butt heads and argue a lot which is what happen when she was here. She currently lives with a roommate out of state. In the past, she lived with three other people who in the end kicked her out (all family). her 4th possible live-in situation her sister decline her coming to stay. So now she is living with i think a non fam member but she is looking to find her own place.  Should I agree to her living with us in the future?