Your youngest is 15 - I would definitely look at getting trained for something you can do at home. Milovany does something like this with college transcripts for the deaf (I think???). She works it around her dh's job and kid's hs schedules. PM her and ask her about it. Also, my dd's psychiatrist seems to have a "receptionist" that works from home. She does all the scheduling either by phone or internet... and probably any billing stuff. There's no receptionist at the office though, so I'm assuming it's some nice at-home work she does for several independent doctors.
I would not rely on a pastor's job unless you were part of a denomination which takes care of it's pastors in some way (Lutheran, Episcopalian, EO). I personally think that kind of job is as unstable as what he's doing now. I know, and have heard of, several who got the boot from their churches, and because they were non-denom. they were on their own. It's nice he's got a temp. job. It sounds like a nice way to use his skills without making it a career. That's just me though.