Where does “siskontytär” come from?

siskontytär (Finnish) comes from Finnish Sisko, from Finnish sisar, from Proto-Finnic sesar, from Proto-Balto-Slavic swésō, from Proto-Indo-European swésōr, from Proto-Indo-European su-h₁ésh₂-ōr, from Proto-Indo-European h₁ésh₂r̥ — blood.

Ancestry of “siskontytär”, step by step

siskontytär traces back through two separate lines of ancestry.

via Finnish Sisko

StepLanguageWordMeaning
1FinnishSiskosister
2Finnishsisarsister
3Proto-Finnicsesarsister
4Proto-Balto-Slavicswésōsister
5Proto-Indo-Europeanswésōrsister
6Proto-Indo-Europeansu-h₁ésh₂-ōr—
7Proto-Indo-Europeanh₁ésh₂r̥blood

via Finnish tytär

StepLanguageWordMeaning
1Finnishtytärdaughter
2Proto-Finnictüt'ärdaughter
3Proto-Balto-Slavicduktḗdaughter
4Proto-Indo-Europeandʰugh₂tḗrdaughter
5Proto-Indo-Europeandʰewgʰ-to produce, to produce something useful; to be...
Every word from Proto-Indo-European h₁ésh₂r̥ →Every word from Proto-Indo-European su-h₁ésh₂-ōr →Every word from Proto-Indo-European swésōr →