First off, Hollywood of the 30`s, 40`s and 50`s wasn't the same Hollywood of today. Since the beginning of civil marriages, most divorces ahve been acrimonious. Until 1962, Reagan was a Democrat, a conservative Democrat! Finally, Patty and Ron Jr were the two Reagan children who didn't get along with their Father in their younger days. Maureen and Michael never had big problems with their Father.
Btw, Rudy Giuliani is no Ronald Reagan. The comparision is insulting to the legacy and memory of a great American.
Reagan was an FDR Democrat, a bigtime new dealer.