Conversation so far:
Who was Bobby Fischer's father?
In 2002, Peter Nicholas and Clea Benson of The Philadelphia Inquirer published an investigative report that indicated that Bobby Fischer's biological father was actually Paul Nemenyi.
Did Paul Nemenyi have any great achievements?
Nemenyi, a Hungarian mathematician and physicist of Jewish heritage, was considered an expert in fluid and applied mechanics.
Who is Bobby Fischer's mother?
Regina Wender Fischer
Did Bobby Fischer have any notable achievements?
At age 20, Fischer won the 1963/64 US Championship with 11 wins in 11 games, the only perfect score in the history of the tournament.
Is there any other interesting information about Paul Nemenyi besides his parents and achievements?
Nemenyi made monthly child support payments to Regina and paid for Bobby's schooling until his own death in 1952.

Question: What concerns did he have about Regina raising Bobby?
Self-contained rewrite: What concerns did Nemenyi have about Regina raising Bobby?