20k might have strings attached, taxes, and if he's getting State assistance, 20k could cause problems as in losing that assistance.
Is not easy being a single male parent. You don't get the assistance that female single parents get, at least not in my experience. I was raising my daughter by myself and applied for help but always got turned down. "There's a 6 month waiting list" but the single mom I knew got assistance immediately.
So I empathize with the guy, if he's getting assistance, he has to avoid any hint of financial gain.