"You two don't have mothers?" Good luck getting her off that subject for a while, or at least until she meets Toriel and deems her worthy of watching over the two children. "I would gladly step in. No matter how kind the people here are, there is no proper substitute for a mother."

She pauses to nose Serif in the chest. "Six months? My children are about your age. Of course, they aren't here..." a slight sigh, and she backs off. "But, perhaps they will be one day, and you all can meet properly."