How can someone speak their first language/mother tongue with an accent from another language?

asked 2020-06-23 14:58:02 -0400

I was born and raised in Sweden and Swedish is my first language, however, my grandpa was an immigrant from WWII Germany and I spent a lot of time with him and granny. I started learning Geman at 13. I am now the only person in my family who speaks with a german "r" (tongue root) instead of a Swedish "r" (tip of tongue against upper row of teeth). German sounds also come easier to me than Swedish. I have been made aware by other people that I speak English with a slight German accent (mostly specific sounds). I am curious as to why it is this way for me. Is there a linguistic science behind it or is it mostly just connected to national identity?

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