Information on my Ancestors- Lomakin, Raspopova, Myasnikov

Hello, I wanted to reach out and see if anyone could point me to more information on my ancestors. We have very limited information.
Here is what I know.

Peter Ivan Lomakin: My great grandfather, born on or around 1 October 1915 in Tambov Oblast.
Nina Myasnikov (Lomakina): My great grandmother, born on or around 22 January 1916 in Rostov Oblast.
Genady or Gennady Peter Lomakin: My grandfather, son of Peter and Nina, born on or around 22 March 1937 in Rostov Oblast.
Mikhail Myasnikov and Anna Raspopova: Nina's parents, nothing else is known. They were Don Cossacks.
Peter and Nina were married at Aleexevka, Rostov Oblast, on 15 June 1935.

Please let me know if you have any information!

Sincerely,
Jacob A.