I wonder if universities pay doctoral students stipends for teaching under graduate classes?This possibility would also answer the question of whether he worked anywhere since moving to WA. It has not been mentioned. How did he get money? I think the only job I’ve seen referenced was at a pizza place in PA and the school on PA as security.
Even if they do, I imagine that any payments would be minimal outside of perhaps doctoral students with high powered engineering, accountant etc type degrees.
As a result, your question regarding cash flow could well still stand (previous known jobs not exactly conducive to saving alot of money) and reinforce @Fargo 's moon lighting possibility and contact by a ride or dinner delivery.