Where does “pikkusisar” come from?
pikkusisar (Finnish) comes 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.
pikkusisar (Finnish): little sister
Ancestry of “pikkusisar”, step by step