Where does “usynowiać” come from?

usynowiać (Polish) comes from Polish usynowić, from Polish synowy, from Polish syn, from Old Polish syn, from Proto-Slavic synъ, from Proto-Balto-Slavic sū́ˀnus, from Proto-Indo-European *suhnús.

Ancestry of “usynowiać”, step by step

StepLanguageWordMeaning
1Polishusynowićto adopt a son
2Polishsynowyson
3Polishsynson
4Old Polishsynson
5Proto-Slavicsynъson
6Proto-Balto-Slavicsū́ˀnusson
7Proto-Indo-European*suhnús—
Every word from Proto-Indo-European *suhnús →Every word from Proto-Balto-Slavic sū́ˀnus →Every word from Proto-Slavic synъ →