Saturday morning in the subdivisions off Grayson Highway sounds like May — sprinklers going, a dog somewhere, mowers working one street at a time. FATHER AND SON LAWN SERVICE moves through Lawrenceville on that rhythm, cutting yards to an even height, trimming close around swing sets and mailboxes, edging the walk so the line runs clean all the way to the porch. Hedges get shaped, beds get mulched, and the driveway gets blown down to bare concrete. Kids are back out on the grass by afternoon. That is really the point of the whole thing.