Sir Mark Thatcher, 2nd Baronet (born 15 August 1953) is a
British businessman and the son of
Margaret, Lady Thatcher, former
Conservative British Prime Minister, and
Sir Denis Thatcher, 1st Baronet, and is the twin brother of
Carol Thatcher. He has two children by his first wife, Diane Burgdorf; Michael Thatcher (who is
heir apparent to the baronetcy), and Amanda Margaret Thatcher. He married his second wife, Sarah Jane Russell, daughter of Terry Clemence, a wealthy property developer, and sister of
Viscountess Rothermere, in 2008.