Passions (1984)

A man with a wife and daughter also has a son with another woman. When he dies this little secret is revealed to the wife. She then sets out to make the woman and her son suffer by trying to throw them out of the house he bought for them but now it legally belongs to his wife. And at the same time, the woman wanting to ensure her son's future, she sues his estate for her son's education fund. While they are butting heads, they both discover that they were both deceived by him.