Help finding about Sitnitskys from Russia— my grandparents #usa #russia

Ellen Sinett

I am trying to learn more about my grandparents who came from Libaw, Russia in 1911.
My grandfather Alex Sitnitsky, was born in Iwankoff Russia on 2/1/1883. He was married to Ethel and they lived in Rockaway Beach, Ny when they came to the US, according to the naturalization papers that I found. Ethel had 7 children but there is rumor that Alex had a child by someone else. No one living knows much about these grandparents. I can’t find Ethel’s maiden name or anything else about

Can anyone help me with my search? My dad changed the name to Sinett around 1945-46, but I don’t think any Sitnitskys in the US are my relatives, but it is possible.

Thank you for any suggestions.

Ellen Sinett