Mother's Boys (1993) on Netflix

Plot summary

Jude Madigan leaves her husband, Robert, and their three sons, Kes, Michael and Ben, suddenly and without explanation. Three years later, when Robert files for divorce, she comes back and sets out to reclaim her place in the family. Robert refuses her and insists on the divorce. He has fallen in love with Callie Harland, an assistant principal at the boys' school. Jude does not accept his decision. She tries to seduce him, without success, and she harasses Callie. She also works to turn the three boys against Callie, and she convinces Kes that Callie stands in the way of the family being reunited.