What's he going to do sleeper, take your kids to the bank?
I know two families that have adopted, one went perfectly and one is a disaster that probably won't end well. The first one is a buddy of mine that I went to Maumee Valley with, his parents are millionaires and decided one winter to add an adopted Russian boy to the clan. So they flew out to Moscow and then to Siberia and found some cute little boy. The kid they picked got to live the life of lavish luxury, and then rest got to stay in Siberia....one lucky kid. So this kid is now like seven and has yet to have so much as a cold; apparently the germs he was exposed to in Russia are far worse than anything in this hygienic first-world country, either that or he should be in Unbreakable II.
The second example is a ladyfriend of mine's family. They're rather loaded too and very religious, so they flew out to the Philippines and into some orphanage and told them to give them the child "no one else would want." Very Christ-like. However they handed them this Filipino kid that has autism and a slew of other mental problems. Long story short the kid is now an aggressive eighteen-year old and has made their life a relative hell. He literally lives each day to piss off his adopted parents; his parents are fervid Christians....so he decides to convert to Islam, and then Judaism just to fuck with them. Then there was the time he tried to kill them with a pair of scissors. They certainly have a ticket to heaven though.
So my only advice to you is if it's between a insanely-healthy Siberian or an autistic Filipino, I'd pick the Siberian.