Bukovyna, which had the best Ukrainian schools and cultural-educational institutions of all regions in Ukraine before World War One. The Ukrainian Orthodox were the majority, but the Ukrainian Greek Catholics had a deanery in Chernivsti (capital of today's Bukovyna oblast) which was subordinated to the Lviv archeparchy from 1811 and from 1885 to the Stanyslaviv eparchy. There was a not insubstantial movement between Ukrainians from Galicia (Halychyna) to Bukovyna and visa-versa. There were intermarriages between Ukrainian Catholics and Ukrainian Orthodox in Bukovyna. Some times the parents would make agreements that if the child was a boy, Orthodox would be he, a girl Greek Catholic. I personally know of such circumstances.
As a digression. Russian Tsarist law stated that in case, the husband and wife were of a different faith, the sons would be raised in the faith of the father/husband and the daughters would be raised in the faith of the wife/mother, unless the two parties agreed otherwise.