Sociopathic sibling has a baby son and shows very limited affection or consideration towards their child, I'm not sure of what should be done or what can be done?

My brother was diagnosed as a sociopath when he was 18, though I never found him sadist or abusive he is impulse and thrill seeks/risk takes. He has never hugged or shown affection to anything as a child and now he's 21. The mother had the baby, gave my brother full custody then basically vanished out of our lives and is near impossible to contact. I think she certainly wasn't interested in the child because he was purely the result of a one night stand.The main concern I have for my nephew is my brother only was interested out of curiosity not because he's the father, everyone told him child raising is a hard responsibility. My brother has taken 0 responsibility in his entire life and even said 'well I have nothing else to do' however he's been raising his son for 4 months. What I've noticed is he never hugs or shows affection to his child my brother feeds and cares for him occasionally playing with him but it's more like he's playing with a toy rather than a baby.Though there's no signs of physical neglect or abuse I'm not sure if it's healthy that this baby will probably not get many hugs or much sympathy growing up, once my nephew was rolling across the floor then looked at my brother and started smiling yet my brother hardly reacted back. We have lots of women in our family and plenty of friends/family who interact with my nephew hugging, kissing, and holding him close, etc. I don't have children but I'm not sure if in the long run having no parent affection and a mother who ran away is going to cause him a lot of problems in the future. via /r/Parenting http://ift.tt/2ivRcDk