“Beth-shean...Taanach...Migiddo...Dor.” These are technically all towns in the tribal area of Manasseh. So “by the borders” includes encroaching on the territory of Manasseh.
“daughter-towns.” The Hebrew text is just “daughters,” referring to small close-by towns that are supported by a “mother” town, a large and normally well-fortified town (see commentary on Josh. 15:45).
“the son of Israel.” Jacob is being called “Israel” in this verse, the name he was given by the angel (Gen. 32:28).