TMB,
Why do you feel the right to be proud of accomplishments over which you had no part? Did you help make your famous ancestor a big tzaddik? Did you have some part in his gadlus? Is it through you that he’s such a great person? Did you, somehow, contribute to his gadlus? If so, then why would you feel pride over it?
Why do you feel the need to be shamed over things that, again, you had no part? Did you ask for an infamous ancestor? Was it your fault that he was infamous? Did you, somehow, contribute to his deeds?
Again, let’s try to separate being happy for something from pride in it.
The Wolf