We have held previously that a putative father, whose paternity has not been adjudicated,may not intervene as of right, pursuant to M.R. Civ. P. 24(a), in a post-divorce proceeding between the mother and her ex-husband where the child was born during the marriage of the mother and her ex-husband. Morrill v. Morrill, 632 A.2d 137, 138 (Me. 1993). We suggested the possibility that permissive intervention, under M.R. Civ. P. 24(b), might be allowed. Morrill, 632 A.2d at 138.