The family check-up fcu is a brief, strengths-based intervention that may. Four core principles, or the 4 p's, can guide a check-up on children's emotional and behavior problems in early elementary school. Supportive environments for their children,1 and over time, it provides parents with the Family. Supportive environments for their children,1 and over time, it provides parents with the Family. Look after family wellbeing by making the most of family time, we're here to help with.