We have one particular little one whose role I suppose is to contain the feelings of wanting a mommy. None of the rest of us have any desire for a mother figure at all. But for L who is three, that is her main role.
She has wanted a mommy figure since forever. Our mother wasn't the kind of mother any child would want. So L spent all her time searching and yearning for someone else to be her mother. To find out what this part of you who wants mommy needs you can work at finding ways to communicate with her. Maybe talk to your T about it.