C. F. Keil and Franz Delitzsch on 1 Chronicles 2:29-31

1Ch 2:29-31

To Abishur his wife Abihail bore likewise two sons, with whom his race terminates. - In 1Ch 2:30, 1Ch 2:31, Nadab’s posterity follow, in four members, ending with Ahlai, in the fourth generation. But Ahlai cannot well have been a son, but must have been a daughter, the heiress of Sheshan; for, according to 1Ch 2:34, Sheshen had no sons, but only daughters, and gave his daughter to an Egyptian slave whom he possessed, to wife, by whom she became the mother of a numerous posterity. The שׁשׁן בּני is not irreconcilable with this, for בּני denotes in genealogies only descendants in general, and has been here correctly so explained by Hiller in Onomast. p. 736: quicquid habuit liberorum, sive nepotum, sustulit ex unica filia Achlai.