These are the names of men. (See: rc://en/ta/man/translate/translate-names)
The word “was” is understood from similar statements prior to this one. AT: “and Mishma was Mibsam’s son” (See: rc://en/ta/man/translate/figs-ellipsis)
the son of a person’s child.
grandson** - the son of a person’s grandson or granddaughter.