2 tenants leaving 1 staying, what to do

I am having a tenant issue that I could use advice on. I have a large house that I am renting to 3 adults and a couple of kids. There has been some sort of domestic dispute and the two women have told me that they do not feel safe living with the guy that is still there. The women have moved in with friends, and want to break the lease. The guy wants to stay. I don't think he will be able to pay rent on his own, but he could get another roommate. It's the middle of winter and I really don't want to re rent the place right now. How do I deal with two tenants moving out and one staying? Technically the woman are still responsible for paying rent, but if the guy is paying all the rent, then the women should be taken off the lease, no? Advice is appreciated.