I'd never let him fall that far in the first place.
Obama described his trip to Kenya in his first book and from what I remember (Read it a few years ago), his experience there was very similar to that of most Africans who accomplish something abroad and go home visiting: Relatives (real relatives and false relatives) show up in dozens, asking for hand outs, and for any hand out given, an even bigger bunch of relatives shows up as the word goes around.
Obama's Father was not exactly a model father, abandoned his wife and kid, when he went back to Kenya. Why should Obama take responsibility for any offspring that his Dad produced years after abandoning him and his mother (and there seem to be many, as he must have been quite a sexually active man...)