While reading history book, I found that Manu had 10 sons. Sharyati (son of Manu) also had one son and daughter named Anart and Sukanya respectively. Where Sukanya married with Chyavan Rushi.
Now, Here is a confusion. If Manu was the first human on earth then from where this Chyavan Rushi comes? I also read that Brahma also had 8 sons. So is there possibility that both generation (Manu's and Brahma's) are living on earth same time?