They are not related.
I don't think he was
5 feet and 6 inches and 1.65 metres (5 feet and 4.96 inches)
June Allyson was born on October 7, 1917 and died on July 8, 2006. June Allyson would have been 88 years old at the time of death or 94 years old today.
Alan Ladd died on January 29, 1964 at the age of 50.