How accountable do you personally feel for what your ancestors did to other people?

Funny enough i was having this conversation just last week there was a programme on about slavery and we got into this discussion i was saying i annoyed because i felt as though i was being blamed for what people did years before and that i didn't feel guilty i didn't do it. However my brother in law is german his granfather was in the SS and he says that he does feel guilty he said he feels really uncomfortable when anyone talks about jewish people in front of him and like he should join a conversation about things to do with ww2