Ya. And truth be told and no matter how much they pretend, ONLY ONE of the women can be her biological mother. Not both.
British Scientists have devised a method to combine the DNA of multiple people, three, maybe even four, and guide this mixture into the production of a child. So, in the near future for those who can afford this process, a child literally can become a suppository of many different DNA, no longer ‘limited’ to just two origins.
It's a simple matter of replacing a males sperm nuclei with the females egg nuclei, then mating the frankenstein sperm cell with the other female's egg cell.