Well don't forget that 0's last name wasn't always Obama. It wouldn't surprise me to learn that this brother was adopted by some guy his Kenyan mother married after he was born. Happened to Barry Soetoro.
That's exactly what happened, although they may just use his name rather than that of that slimeball BHO Sr.
She wasn't Kenyan, but rather Bostonian.
Her sons, have good claim to US Citizenship, since their mother was an American Citizen, and had lived in the US for 10 years, 5 of which were after the age of 14.
If Barry wasn't born in Hawaii, as claimed, he has a much weaker, in fact zero, claim to be a Natural Born US Citizen, because his mother did not meet all those criteria.