Plenty of regular, not DS people are going to have family who served the Nazis. Basically everyone had to serve the party during that time, whether it be needing to join the party in order to just have a regular business allowed to operate, or if they were drafted to fight. There's a big different between someone having to just get by in Germany during the Nazi rule, vs the true believers and people who volunteered to be SS or something. Essentially, anyone who is alive now and had family who were adults in Germany during WW2 are going to have those "Nazis" in their family, so you can't imply much just from that.

Judge an individual person who for they are and the actions they take. Do not punish someone for the sins of their father. Each person is their own self.