Bowlby married Ursula Longstaff, the daughter of a surgeon, on 16 April 1938, and they had four children, including Sir Richard Bowlby, who succeeded his uncle as third Baronet.
Han giftede sig med Ursula Longstaff, datter af en kirurg, den 16. april 1938, og de fik fire børn, herunder Sir Richard Bowlby der efterfulgte sin onkel som tredje Baronet.