Here is a start on tracking relatives.
His family (as of 1944) is listed here:
https://www.fieldsofhonor-database.c...erty-timothy-j
Here is a newspaper article on the death of his father in 1972. Names of the married sisters are included. His brother John P was then in the army. Perhaps a career officer.
https://www.newspapers.com/clip/19797449/
Death of brother: John P:
https://www.newspapers.com/clip/19797731/
2005 - Death of sister Eileen M (Haggerty) Beecher
https://www.newspapers.com/clip/19802671/
Note Eileen had a son named Timothy James (with wife Nita) then living in St Louis.