¿Could they be the 3 spinsters? From the Grimm fairytale??? In the original fairytale they help a girl, who was ordered by the queen to spin a room full of flax, once they help her she is to call them “cousins” and invite them to her wedding to the prince, (it has many similarities to the millers daughter tale in my opinion) maybe in Once they are the ones that take care of Rumple as a kid, and teach him how to spin at the wheel.
Fairytale Link: http://www.worldoftales.com/fairy_tales/Brothers_Grimm/Grimm_household_tales/The_three_spinsters.html
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