You called me “Nige”, to me it seems like that was an insult, and I would consider it to be so. If you didn’t mean it as such then fair enough.
As for your question, I would say a player should atleast have some genuine connection to a country to be able to represent it. For example if a player migrates to a country and wants to represent said country then fine. If a player has never been to said country but has parents from that country I can maybe live with it, grand parents I think you’re pushing it a bit, but I’m not sure I would ban it.
Tuchel though has no real connection to England, so he doesn’t even fall in to that.