This is the 984th most frequent Hebrew word.
ובני
"And [the] sons of" or "And [the] children of"
In this context, 'ובני' translates to 'and the sons of', connecting a group (sons) to their patriarch (Abraham).
ובני אברהם יצאו למסע במדבר.
And Abraham's sons set out on a journey in the desert.
Here, 'ובני' is used as a proper noun, referring to a person named Beni, following the conjunction 'and'.
הזמנתי את שרה ובני למסיבת הסיום שלי.
I invited Sarah and Beni to my graduation party.
'ובני', in this case, means 'and my son', combining possession (my son) with the conjunction 'and'.