If the rental isn't making money, get rid of it.
If your wife doesn't work away from home, how does she see that? What did she do before?
Let me say that I was a sahm for 16 years, and I was not lazy and I wasn't old fashioned, either. My dh worked long hours and was unavailable for parenting between 7AM and 7PM. He didn't cook or clean or do laundry or walk the dog. He got to do the work that he loved, and then came home and did whatever he wanted.
Teenagers take a lot more supervision and hauling around than many people realize.
I went back to work, part time, because our oldest was going to be off to college pretty soon, and a job pretty much fell in my lap. In a lot of ways, it would have been better if I'd been home for another year or two, but we did make it work.
Anyway, if money is that tight, it's time for a serious family budget and planning meeting.