In April 1964, Anni-Frid married Ragnar Fredriksson, with whom she had two children; they divorced in 1970. The following year she was engaged to Swedish pianist Benny Andersson, also a member of ABBA, until they married in 1978. The couple separated in 1980 and divorced in 1981. In 1992, Lyngstad married Prince Heinrich Ruzzo of Reuss, Count of Plauen, who was a prince of the former sovereign House of Reuss; since then she has held the titles of Princess Reuss and Countess of Plauen with the style of Her Serene Highness. Heinrich Ruzzo died of lymphoma in October 1999, leaving her the titles of Dowager Princess and Countess. She currently resides in Zermatt, Switzerland, sharing a home since 2008 with her British partner, Henry Smith, 5th Viscount Hambleden.