How to vet prospects with several foster kids -

[Lois S.]

Got a call from a prospect with a full time job & several foster kids for whom he has guardianship. 

Without the (substantial) payments he receives for each child, he wouldn't qualify under our income criteria.  However, the amount he receives should more than cover the children's expenses. 

I would guess they might be long-term tenants given that it's hard to find suitable SF housing.

Would you consider this prospect?  What else to consider?