That would be even more unreliable because Europeans marry other Europeans on a continuous basis. How many people in the UK have one Irish parent (and vice versa)? A lot. How many russians have a ukrainian parent and vice versa (well, at least before 2014)? A lot. How many Spaniards have a Portuguese parent and vice versa? It's a lot. How many of anyone born in a benelux country have a french, italian, or german parent? Once again, a lot. Especially Schengen countries, which is a majority of western Europe. This isn't even factoring in diaspora Europeans from America, Australia, etc. While it's a small number, it's not insignificant.
Furthermore, I consider that Israel must be destroyed
Furthermore, I consider that Israel must be destroyed