The actress Maria Becker and Renate Becker are his daughters.
Besides his activity as an actor he taught talented young actors, among them Wolfgang Völz.
Theodor Becker as married with the actresses Maria Fein and Helma Seitz. His daughter Maria Becker with Maria Fein and his daughter Renate Becker with Helma Seitz became both actresses too.
The actor Theodor Becker was a successful stage actor who often appeared at theaters in Hannover and Berlin. He was very popular with his Hebbel interpretations.