Colonel John Camden and his wife Ruth are staying over on their way to Hawaii, unannounced. Fearing they will spill the beans, Lucy wants to skip town with Kevin supposedly to help Simon, asking Sandy to cover church service, so she stays in their place with baby Aaron; she's warm to boy-friend Dr. Jonathan Sanderson, chilly to Martin. T-Bone needs help for his first Valentine's day with a girl-friend, Ruthie insists they get matching tattoos, despite his and Margaret's reluctance for permanent markings, having to hide them for the Camdens and a serious needle-phobia. Mac is happy moving into the trio's apartment means 'adult' independence, the girls see domestic misery. When Jane gets her divorce papers from soldier Jack, she wants to wait till after Valentine's day. The grandparents overhear the twins with their parents, and suggest they may soon move for good. Lucy changes her minds and turns up with Kevin.