WWP references both a father and mother in heaven.
W.W. Phelps (writing under the pseudonymn, "Joseph's Speckled Bird"), "Paracletes," Times and Seasons 6 no. 8 (1 May 1845):892
Now the acts of his spiritual body, while he was a child with his father and mother in heaven; and his acts while he was in the spiritual councils of the Gods for millions of years . . .