How do you nicely hint to someone that they REALLY need to get a job or get out?

My brother in law has been living with us rent free since February, been jobless since November. We pay $100 a month for his cell and he has $0 in income so we've never seen a dime from him. We also have a new 3 month old baby to take care of. He is 30 and has 2 boys that also stay here with him more than 50% of the time. So we went from supporting 2 ppl to 6 ppl. I'm not working cuz I have a baby and go to school so we live off one income. I don't know how to nicely kick him in the butt, and say, hey you need to get a job and start helping out cuz we can't continue to support you!