spouse of scouse

Not strictly a UK immigration question, but relevant.

Father - born 1928 in Yugoslavia (later Austria), nationality on passport Austrian. Conscripted into Hitler's Youth and fought in WW2. Migrated to Australia 1952.
Married Australian woman (2nd marriage) 1976. This woman had a 5 year old child born 1971 in Australia, father on the birth certificate listed as unknown. Child legally adopted by mother's Austrian husband in 1976. New birth certificate issued for child, naming Austrian man as her father.

Does the adopted child (now 47) have any claim to Austrian nationality/passport? Cheers.

BritInParis

Possibly, as a child. I don't know for certain but I doubt it would be possible now.

spouse of scouse

Thanks BiP, appreciate your time

Thairetired2016

https://www.migration.gv.at/en/living-and-working-in-austria/integration-and-citizenship/citizenship/

you may find some useful info in this link.
I doubt you are entitled to citizenship.
Austria is not an easy country to get citizenship. They also do not allow dual citizenship.

spouse of scouse

Thanks. The person is not me, I'd have had no problem saying if it was I do believe that Austria allows dual citizenship if they're both acquired at birth.

BritInParis

Austria does restrict dual citizenship but it's possible to have both, e.g. Arnold Schwarzenegger.

Thairetired2016

You have to be a celebrity or be of academic importance to be granted the right of dual nationality. Austria is investigating Turkish nationals who acquired Austrian nationality but who did not renounce Turkish citizenship. They will/have lost their Austrian passport.
In the case you quoted the child wasn't born to an Austrian father or Austrian mother. Chances imho are nil.
I have a personal interest in Austrian citizenship. My only chance would be to settle in Austria for some years without interruption and to make an application to the president. My ancestry isn't recent enough to go the normal route. As I have passed the 70 treshold I decided to continue to spend summers in Salzburg and winters in Asia but keep my present EU nationality.

BritInParis

It would depend on how you acquired Austrian citizenship. If you have held Austrian citizenship alongside another since birth (born in the US to Austrian parents for instance) then you can keep both. You don't have to choose upon reaching the age of majority like Japan. If you were born Austrian but wish to naturalise in another country then you can do so providing you get permission to retain Austrian citizenship. This mirrors the arrangement in Germany. If you a foreign national who wishes to naturalise as an Austrian citizen then you have to renounce your previous citizenship providing it is 'reasonable and feasible' to do so. Hence the Turks you mentioned getting into trouble for failing to do so.