If you mean, who is his wife, then the answer is Michelle Obama.
If the question is really asking about a "waif" of President Obama, since waif is often used to mean: "a person, especially a child, who has no home or friends", then the answer would have to be that he does not have one to our knowledge.
1100
47.
Abraham Lincoln
President Obama doesn't have a son.
Senator.
Joe Biden
Michelle Obama
Ann Dunham
He is President-Elect Obamas senior advisor.
The president and his family do not have a cat; they have a dog, whose name is Bo.
The waif looked lost and alone, wandering the dark streets with no one to turn to for help.
A waif can be either a male or female. A waif is a homeless person and is usually used in reference to a child. Synonyms for the word waif are urchin and ragamuffin.