So that's where her kids get it.
Read the books by Robert Lacey and James Spada. Avoid the glossy stuff.
Grace freaked out later when she was Princess of Monaco over how her past was raked up. The thing is, her family was very domineering, but rather than tell them to go to hell she slept with half the industry and let them pressure her into a relationship with Prince Ranier.
Her family was not part of Main Line society (despite their airs) and frankly they were hideous to the men Grace brought home. Don Richardson was a Jewish actor and supposedly they made Jewish jokes in front of his face and were worse to Oleg Cassini.
They supposedly threatened him with physical harm until she and him broke up, and anyone else Grace got serious with. She also almost broke up Ray Milland’s marriage.