is gyne primarily genetic?

[vic007]

Iv'e had gyne since 12/13 (18 now) and i noticed that my little bro was starting to get it too.  My other bro (16) has it also but not nearly as puffy as mine.  Wondering if other siblings have it too because in my eyes it seems to be genetic.

[P_L]

My Dad has large breasts because he's chunky.  Nowhere near as large as mine though (his look anatomically correct in accordance with his body size).  Nobody else in my family tree has had this problem... I don't really believe everything "experts" says about genetics, besides your basic physical attributes.  I come from a Mexican family, and I look white, even my white Dad looks darker than me (wtf!?) My grandpa on my Mom's side is almost black (tex-mex), but Mom is fairly white, although she comes from a purely mexican family.  Eh...

[nipman]

Im sure genetics play a large role, but I wouldnt be suprised if all these hormones that are in food these days didnt have something to do with it. 

[hertog88]

my dad doesn't have it, nor does my brother... nor my fat uncles....... nor my cousins... nobody just me..... hehe. but im also the most handsome so whateevr

[sadboy89]

yeah i guess my dad had it in some degree im not sure-he has some somewhat large breasts these days and said he had puffy nips like mine-i got it when i hit puberty and my little bro got it too which i was really sad about but his didn't develop into anything like mine so good for him i guess-yeah definite underlying genetic causes id say