One? That's hard. I suspect though it's: make sure that he and especially his parents are fully comfortable with the amount and quality of time that you are spending with him.

You might want to follow HFJ's story through which starts

http://cblf.org/messages/60362.htm

and finishes with what appears to be a very healthy positive relationship

http://cblf.org/messages/62089.htm

as his situation seems to have been somewhat similar.

Great to see a new arrival appreciating the board; I'm very conscious of what a blessing it has been to me, and it's great to see other finding us.