Separation from the father can lead to substantially earlier menarche - and study shows that it is *not* genetic. http://psycnet.apa.org/journals/dev/44/5/1409/ …
@Mangan150 ...before taking off that the younger daughters reached an earlier menarche - pg. 164: http://books.google.com/books?id=2P3GAgAAQBAJ&pg=PA246&dq=Impact+of+fathers+on+daughters%27+age+at+menarche&hl=en&sa=X&ei=gOW9U6e3IOjoywOI74Ag&redir_esc=y#v=onepage&q&f=false …