According to verse 19, Mahli and Mushi (verse 47) were brothers. Apparently Mushi named one of his sons after his brother.
Quoted with permission from Omanson, Roger L. and Ellington, John E. A Handbook on 1-2 Chronicles, Volume 1. (UBS Helps for Translators). Miami: UBS, 2014. For this and other handbooks for translators see here .