Similarities to 'Jaws: the Revenge'

....a widow (Lorraine Gary/Doris Hare) agrees to go on a chaotic family holiday, which includes her trouble making grandchild (Judith Barsi/Adam Rhodes), and where she unexpectedly falls in love with a drunken bloke (Michael Caine/Wilfrid Brambell) a relationship which causes concern for her grown up son (Lance Guest/Reg Varney) and his wisecracking best friend (Mario Van Peebles/Bob Grant), who are simultaneously being pursued by a vengeful character from the family's past (Jaws/Blakey).

Uncanny.