Jankiel Kostrzewka
M
| Father* | Michel Kostrzewka |
| Mother* | Sora unknown |
Jankiel Kostrzewka was the son of Michel Kostrzewka and Sora unknown. He married Rochla Pesia Skowronek, daughter of Szmul Skowronek and Jenta Sukiennik aka Wolkoska, in 1886 at Wysokie Mazowieckie, Mazowieckie, Lomza.