John Gill Commentary 1 Chronicles 4:27

"And Shimei had sixteen sons and six daughters; but his brethren had not many children, neither did all their family multiply like to the children of Judah." — 1 Chronicles 4:27 (ASV)

And Shimei had sixteen sons and six daughters
None of which are mentioned by name:

but his brethren had not many children :
Hamuel and Zacchur:

neither did all their family multiply like to the children of Judah :
to show the fruitfulness and great increase of which tribe, the genealogical account of it, in this and the two preceding chapters, is given.