I am not related.
1.I see a Freeman Custer on Facebook. You might try to comtact him.
2. Sign the condolence page on Lena Croom Custard's obituary explaining that you are a relative and seeking info.

3.It appears Bernice Winlock lives in the Cleveland, Ohio area
4. Put a query on the Custer Rootsweb Board about looking for information on John Custer. List all places that he lived...cities and counties...anywhere he worked, any military service

Good luck