1. A minority is a group of people who consider themselves a minority.

2. A native minority is a group of people of which the members are born
in the same territory in which they will be considered a minority _and_
is a group of people who consider themselves a minority.


That means that my definition doesn't require a people to have lived
in a certain territory for several generations. They might even have
been moved there by force by a country. Russians in Estonia that are
born in Estonia are natives just as the Estonians themselves. And the
opposite: having a father and/or a mother from a territory doesn't make
you a member of the _native_ ethnic minority when you move there, but
you could still be a part of the minority if you simply consider
yourself that. If you additionally speak the minority language and is
brought up with the culture in your own home, things are getting
trickier but basically you are not a member of the native minority.
Historic presence in another territory for a group of people also puts
some argumentative pressure for that group to be considered a native
minority when they move to the territory but is not enough in my
opinion. They need to be born and at least partly raised there.

It's getting even more complicated if you are born in a territory and
then raised in another during longer periods of your childhood. Then,
there are no definite answers but where you're born is always important.
If you have lived in a territory until you're an adult, it doesn't
matter where you live after that according to my definition.

If Sudet Germans return to the parts of Czechia where they were born,
they immidiately become a native minority. In the case where somebody
is eg five years old when he was expelled to Germany, see the
paragraph above.

In Sweden, the native minority of Finns (not Tornedalians) are those
Finns that are born in the country (from immigrant parents presumably)
and who consider themselves part of a Finnish minority.

These definitions are in some ways intended to suggest language use
rather than to give opinions on what political consequences this should
have. You might want to make widely used languages official even though
only immmigrants and no or only a small native poulation speaks it. You
might want to support a language whose speakers never have identified
themselves as a minority. Etc.