Ancestry DNA says I'm 10% French. My father never got tested, but my half sister and cousin on my father's side (who were both identified by the site) both tested as 100% European Jewish. My comparison to my mother (she's on the right) is below. 10% seems well outside the margin of error, but it seems that if my father had enough French for me to get that my sister and cousin would have some too.
I got surprisingly little Italian and German. Maybe the French, Turkish, Spanish should have been Italian and German? Or can something negligible for a parent be non negligible for the child?