Look slimmer - your shoulders are the widest part of your body. When you stand square to the camera, it makes you look wide! Instantly lose by just turning your shoulders to a 45 degree angle to the camera (slightly to the side).
This is one of the cutest family photo poses I have seen! When Mom is happy and gives/receives a " kiss", look what the children do .they see love and they give love to one another. A family that reaches out to love. remains in love.