Presidential in-laws

When Barack Obama's mother-in-law moves into the White House later today, she'll be joining an elite group of in-laws. Four other presidential-in-laws have lived at the White House: Ulysses S. Grant's father-in-law, Harry S Truman's mother-in-law, Dwight D. Eisenhower's mother-in-law and Benjamin Harrison's father-in-law.

When as if his mother-in-law is moving to 1600 Pennsylvania Avenue, Barack Obama tells 60 Minutes, "Well, I don't tell my mother-in-law what to do." Obama went on to offer 60 minutes correspondent Steve Croft some tips on dealing with mother-in-laws. All joking aside, experts say two things are necessary to keep the peace. The Obama's need to discuss privacy and disciplining the children ahead of time. You can find more information about Michelle's mother here.