I've seen that one and a few others before , fun listen. I would say that their native language became English though as both are better in English than dutch. My mom is a dutch immigrant who came over when she was 12, she's kept it up with her family in Holland through the years but the dutch were huge on adopting English when they came to the US or Canada. They are practical that way. Alex speaks it better than Ed to my ear though but again, he was older so would ha e grasped more before coming over...but that interview is just small talk bullshit lol.