private statistic

my 13 year old son had been playing tennis with his best friend who is a similar age.the other bed time he told me he was worried that when they were showering he noticed his friends willy was a lot bigger than his.I told him not to worry his friend is just a little ahead of him.,he ,ll catch up.Last night i heard my wife talking to him at bedtime and he raised the subject with her.i heard her say don,t worry you tend to inherit your penis from your father and if you grow as big as your dad you,ll have nothing to worry about.I am actually endowed but should my wife have revealed this to my son,i feel embarrassed now.