If I were to self-publish my kid, I'd ACT like a publisher.
First, he'd have to polish that MS until it shone (lots of rewrites and resubs, I imagine.)
Second, he'd have to submit to me a detailed marketing plan. If I accepted it, he'd have to sign a contract obliging him to follow through with the marketing plan. A list of pre-sales would determine the initial print run.
Third, if he didn't want to do the above (that is, act like a pro), I'd just have a few copies printed off as gifts for family and friends. As many as the kid was willing to pay for himself. Hey, kid, here's the difference between vanity and pro. Vanity pays, pro gets paid.
Self-esteem comes from real achievement, not from parental subsidies. Praise the kid for the hard work of even producing a book-length script (or story or whatever.) Maybe even print one copy for him. But pretend that just any old MS deserves commercial or quasi-commercial publication? Nope.
Now, if the kid really had written a book I thought worthy of commercial publication, I'd tell him to get an agent.
Oh, and when Six catches up with Avatar Thief, well, it's not going to be pretty....