my husband wants to throw my 26 yr old son and his wife out tomorrow

last April my son was thrown out by his father and younger brother. He had no where to go so I told them to come here to NJ. Finding work was a big set back for them but now they have found a really good job and are becoming company in two weeks. My husband (a stepfather) can't stand my son for some reason and wants him out. My husband gave him until tomorrow despite what I say. My son has not been destructive, nor has he damaged our home in anyway. He buys his own food, washes his clothes outside the home. I as his mother cannot allow this to happen, I am so fed up with my husband that I am leaving him. My husband refuses to allow my son and his wife to help with expenses. Since Christmas work has been slow for all of us, they work one or two days, since turning company they are getting more hours and need time to save up for a place of their own. Is there anyway I can back my husband off legally? My husband said he can have them removed in 15 minutes legally.