The mbr full form is an abbreviation for Member of the British Royal Family.
The mbr full form refers to the members of the British Royal Family. The term is mainly used to refer to members of the male line, those that are born in a particular rank and have a certain title.
The term was first used in 1837 by George IV, when he was made Prince Regent and assumed some of his mother’s titles.
Member of the British Royal Family