1)
Below (23:21-22), we find that Machli's sons were Elazar and Kish, and he did not have a son Livni!
1.
Malbim #1: We must say that Livni was his grandson - Ben Kish 1 .
2.
Malbim #2: Merari had two descendants Machli (23:21, 23) - here we discuss the latter, Ben Mushi, and teach that he had a son Livni. Below (29-32), we find that he had another son Shamer, from whom Eisan descended.
1
He cannot be Ben Elazar, for Elazar died without sons (23:22). (PF)
