findagrave.com suggests he was also married to Maggie Elaine (Webster) Marston but analysis of the associated dates make this unlikely. Maggie is also not mentioned in Merlin's obitusry, which does state he had two, not three, wives.
His obituary lists numerous children but as his wife was over the age of forty-one when they married they may have been adopted. The obituary does indicate at least one son was adopted.