Where does “szwigra” come from?

szwigra (Silesian) comes from German Schwieger, from Middle High German swiger, from Old High German swigar, from Proto-West Germanic *swegru, from Proto-Germanic swegrō, from Proto-Indo-European sweḱrúh₂, from Proto-Indo-European swéḱuros — father-in-law.

Ancestry of “szwigra”, step by step

StepLanguageWordMeaning
1GermanSchwiegermother-in-law
2Middle High Germanswiger—
3Old High Germanswigar—
4Proto-West Germanic*swegrumother-in-law
5Proto-Germanicswegrōmother-in-law
6Proto-Indo-Europeansweḱrúh₂mother-in-law
7Proto-Indo-Europeanswéḱurosfather-in-law
Every word from Proto-Indo-European swéḱuros →Every word from Proto-Indo-European sweḱrúh₂ →Every word from Proto-Germanic swegrō →