Where does “grandson-in-law” come from?

grandson-in-law (English) comes from English grandson, from English Sơn, from Middle English sone, from Old English sōna, from Proto-West Germanic sān(ō), from Proto-Germanic sēna, from Proto-Germanic *sa, from Proto-Austronesian *əsa.

grandson-in-law (English): The husband of one's granddaughter or grandson

Definitions

  1. The husband of one's granddaughter or grandson

Ancestry of “grandson-in-law”, step by step

grandson-in-law traces back through two separate lines of ancestry.

via English grandson

StepLanguageWordMeaning
1EnglishgrandsonA son of one's child
2EnglishSơn
3Middle Englishsoneson; soon; Alternative form of sonne
4Old Englishsōnaimmediately, at once
5Proto-West Germanicsān(ō)immediately
6Proto-Germanicsēna
7Proto-Germanic*sa
8Proto-Austronesian*əsa
9Proto-Oceanic*isa

via English in-law

StepLanguageWordMeaning
1Englishin-lawA relative by marriage (or through affinity)
2English-in-lawRelated through marriage
3Englishmother-in-lawThe mother of one's spouse; A mother-in-law...
4Middle Englishmoder in lawemother-in-law
Every word from Proto-Oceanic *isa