Quote bolin: I don't think Jeanne Cooper is leaving the show, at least I hope not. She's the only original cast (and much loved) cast member. Forgetting the same last name thing, the Amber adoption idea could work: Maybe her birth mother had a relationship with Katherine's son Brock that ended very badly and she had no option but to give Amber and her sister up for adoption...which would make Amber Katherine's granddaughter...
Another Brock relationship that ended badly? That's how Mac came to be. Brock really gets around!