These numbers refer to each of the brothers and can be expressed as such. Alternate translation: "the second brother ... the third brother" (See: [[rc://en/ta/man/jit/figs-ellipsis]])
This is a metaphor for a child. In this context it refers to a son. See how you translated this in [Mark 12:19](./19.md). (See: [[rc://en/ta/man/jit/figs-metaphor]])