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According to this study in rats, penis length appears to be affected by fetal exposure to testosterone in utero. There’s a critical window in gestation where the more testosterone the fetus gets, the larger the penis. Outside of this window, testosterone does not have an effect on the ultimate size. As for genetics, there don’t seem to be any studies. You could try a google scholar search. If you run into a paywall use sci-hub.
https://mrc.ukri.org/news/browse/penis-length-is-determined-early-in-fetal-development/
https://mrc.ukri.org/news/browse/penis-length-is-determined-early-in-fetal-development/