She whelped Chelsea.
She's Chelsea's mom.
Chelsea's dad is an open question.
She is one of the nastier people in a nasty profession. Lawyers are also generally speaking nasty people and they are drawn to politics.
There are conspicuous exceptions in politics (and even in law) — Ronald Reagan was tough, firm, but seldom nasty. Whatever one thought of W, he wasn’t a nasty man (but he had one running the show, love ya anyway Dick Cheney).
Nixon? Well, point made.