Where are the details of this available?
I don’t know anything about the brother. But all the details about the family have been posted here, and apparently Obama’s unreadable exercises in self-definition, his “autobiographies,” contain information on them.
The grandfather, of course, is the one who thought that Barry should be brought up by Frank Marshall Davis, a black Marxist radical with sexual obsessions.
The daughter, Obama’s (again, putative) mother, was a typical red diaper baby, and had indeed been raised by two very left-wing parents, Obama’s white grandfather and grandmother.