Usage patterns
〈人〉と連れになるto become traveling companions with someone
I became travel companions with someone I met on my trip.
連れがいるto have a companion with you
I have a companion with me today, so I chose a quiet restaurant.
〈数〉人連れで来るto arrive as a group of __ people (companions)
The family came on the trip as a group of four.
Expressions
につれas; with; in proportion to 連れてくるbring someone along; bring (a person) につれてas; with; in proportion to 馬は馬連れbirds of a feather flock together; like attracts like 道連れにするforce someone to come along; drag someone into something