Adam and Nicole (1975)

A pair of brothers, Martin and Paul Barnard, are summoned to the family home after the death of their father. Solicitor Mr Gold informs them that they won't be allowed in the house until the reading of the will, and they're forced to stay in the cottage occupied by their father's servants, Adam and Nicole. As well as chauffeur and procurer of bed-mates (including his own lover Nicole) for Mr Barnard, Adam was his eldest (though illegitimate) son, and Martin in particular is terrified he'll inherit all the old man's moolah.