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Of course, you know that would be the Obama family and a dog to be named at a later date.
But there is a possibility that Marian Robinson will be joining them. She is definitely moving to DC to help with the care of her granddaughters, but it is as of yet unclear whether she will be moving to the White House or to a residence of her own.
If she does take up residence at the White House, she will not be the first mother-in-law-in-residence. (Trivia question: name her!)
Harry Truman's mother in law briefly lived in the White House, but hated it, and went back to Missouri. Rumour has it that she really disliked her son-in-law, and believed Dewey was going to beat him in '48.
While a father-in-law is not a possibility for the Obama family, if it were, it wouldn't be a first. Benjamin Harrison's father-in-law moved to the White House in 1889.