SERENADING HIS SON The Circle P has always been home to the Judds. That's why Garrett Judd came back--to take over as temporary ranch manager and to shelter his infant son in the warmth and love of his sprawling family. Bluegrass singer Lisa Rose isn't part of his long-term plans. But ever since she hit town, the single father has been fighting his attraction to the willowy blonde. Lisa gave up her life on the road to open a music store, but if business...