I have several Anuszkiewicz people in my tree. None are blood relatives.
The oldest one I have is Franciszka Anuszkiewicz, wife of Antoni Galazin. she 1950's from Jalowo, also in the Jeleniewo parish. It's possible your man was a was born in Podsumowo in the Jeleniewo parish. There's a Henryk Anuszkiewicz, born in 1929 who married into a Borkowski family in the early son of a male relative in your family.
About when were Kazimierz and Ludwik born?
There 1,351 people with the last name of Anuszkiewicz in 1990. Almost half of them were from the province of Suwalskie. There was no one with the name of Anuskiewicz in Poland.
Tina Ellis