Genesis 11:19
“And Peleg lived after he begat Reu two hundred and nine years, and begat sons and daughters.”
KJV
Read in Genesis 11Meaning
Peleg lives another two hundred nine years after Reu's birth and has additional sons and daughters.
Read carefully
The genealogy's focus on one named descendant is a narrative selection, not a denial of the other children the verse explicitly mentions.
Reflection
The biblical story often advances through one traced line within much larger human families.