My father had a half-brother from his father. I don't know his first name or birth year. The half-brother was born from the 1910 to 1930s.
My grandfather was Pavel Ivanov. He was born on December 15, 1885. His father was Ivan. My grandfather last lived in Taganrog, where my father was born. My father had the same birthday as Pavel Ivanov, who was avid gardner.
I have more details on places my grandfather lived and his work if anyone thinks they have information for me. It would be a dream to find this man.
Anyone who can give me hints how to find this uncle would be appreciated.