She died when he was a young boy.
Ann Dunham
His father was an economics student from Nairobi, his mother a white American anthropology student when they married. http://www.nndb.com/people/208/000055043/ Mother..White American AKA European American. English and Irish.
1100
47.
Abraham Lincoln
President Obama doesn't have a son.
Senator.
Joe Biden
Michelle Obama
He is President-Elect Obamas senior advisor.
Yes, according to newspaper reports, Marian Robinson did accompany the family to Cuba; this is not entirely surprising, since the "First Grandmother" is very close with the president and Michelle's two daughters and has often taken care of Sasha and Malia when the president and first lady need to be at a diplomatic function.
The president and his family do not have a cat; they have a dog, whose name is Bo.