but we don't all speak Indo-European. Not if we're Basque or Finnish maybe. But most of us do, I suspect, whether we speak English, Welsh, Russian, Urdu, Gujarati, Farsi, Spanish... and so forth.

"Also there's some parts of Belgium where a dialect is spoken which is very similar to Welsh...could be walloonish or flemish."

Walloon is closely related to Frrench, and Flemish is closely related to Dutch. If there is a part of Belgium where they do speak a language similar to Welsh it'd be interesting to have some details. On the face of it is seems unlikely.