My grandfather who died shortly after the war, was until 1933 the town council leader ('Zentrum', [Catholic] centrist party).
Mother's father, who died when I was 10, has been a 'national-liberal' before 1933, and in 1946 the co-founder of the liberal party in my native town.
However, none of my parents were politically active, though my father was in some town and county councils on the list of the Christian Democrats (conservatives).
I became politically active at school, mainly due to history lessons, when the "German Emergency Acts
" were discussed. (I was nearly thrown out of grammar school since I had the full text before the press got it - I don't know why, but I really got the full text of the bill as written by some experts in the ministry.) A couple of months later, I was in Berlin when a student was killed by a policeman
... (all that was in 1966/7).
My political ideas were certainly left - but I didn't join one of the students organisations because I wanted to join the public service and ALL were extremely left in the early 1970's. (However, I nearly became a member of the student parliament as candidate for the group 'save the opening hours of the university pub'.)
I did try to join the Social Democratic Party. But they were really ... conservative in those days.
I didn't join the Green Party - though I might have been very close to them with my own ideas - because I missed a real program, a political perspective in the 70's.
It wasn't until the 80's that I finally became a member of the Social Democrats. Have been in town and district councils for them, worked for our member of parliaments (European, federal and state), edited/wrote for a local quarterly paper ...
But I've stopped now being politically active, besides being a poll worker for the party every couple of months ...