Mike Tindall has been part of the Royal Family for over a decade after marrying Zara Tindall in 2011 and he has now revealed how he addresses his mother-in-law Princess Anne in private

"M'am, not Mum!" said the retired rugby star, who is married to the Princess Royal's daughter, Zara Mike Tindall knows just what to call his royal mother-in-law, Princess Anne. On Nov. 4, the retired rugby star made the revelation while appearing on Good Morning Britain to discuss his new book,

Mike Tindall has been part of the Royal Family for over a decade after he married the daughter of Princess Anne, Zara Tindall, in 2011, and he has finally revealed how he addresses his mother-in-law in private.