Section 1. Growing up with cohesive coparenting : optimizing triangular communication. The baby and the couple : some theory and research foundations -- Early infancy : primary triangular communication / with Chloé Lavanchy Scaiola -- Microanalytic method of infant's engagement -- Late infancy : secondary triangular communication / with Sarah Cairo -- Toddlerhood : symbolic and moral triangular communication / with Francesco Lopes -- From triangular to multiperson communication / with Nicolas Favez -- Child behavior assessment tools at age 5 -- Pregnancy : coparenting in formation / with Antoinette Corboz-Warnery -- Section 2. Growing up with non-cohesive coparenting : derailed triangular communication. Coping with excluding coparenting / with Miri Keren -- Coping with child-at-center coparenting -- Coping with competitive coparenting / with France Frascarolo-Moutinot -- Section 3. Clinical applications of the LTP paradigm. The LTP paradigm as a model for clinical consultations / with Joëlle Darwiche -- An in-depth look at the LTP and video-feedback / with Antoinette Corboz-Warnery -- Reflective family play : a brief family therapy combining the LTP with Watch, Wait, and Wonder / with Christie Hayos and Hervé Tissot -- Clinical applications of the LTP at other sites.