When Peter Muldowney was born on 24 May 1891, in Walsall, Staffordshire, England, United Kingdom, his father, Malachi John Muldowney, was 38 and his mother, Margaret Molloy, was 35. He married Annie Shaw on 26 August 1916, in Walsall, Staffordshire, England, United Kingdom. They were the parents of at least 1 son. He died in December 1969, at the age of 78.