2009-09-08 17:36:02 -

Former ABBA couple BJORN ULVAEUS and AGNETHA FALTSKOG reunite every festive season - for their two young grandchildren.
The stars wed in 1971 and had two kids, Linda and Peter, before their divorce in 1980.
Both went on to remarry - but

they remain close for the sake of Linda's children, eight-year-old Tilda and Esther, two.
Ulvaeus tells Hello! magazine, "I see Agnetha quite often because we have two grandchildren together and they want both Grandma and Grandpa there at Christmas and things like that."