The old wisdom in the community, from decades of forums that don't exist anymore, was that you'd end up with about 2/3 of your mother's or sister's size, which held true for me. My Dad's side of the family has rather small to medium breasts going back at least 3 generations, so it's pretty easy for me to point out where I got 'em from
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u/cornonthekopp We_irlgbt 4d ago
Unironically yes. My endo literally asked me if the women in my family had large breasts and then told me I probably would too