Teaching Grand Children the model and mental health. Ages 2 – 7

First I want to let you know how much I am learning in SCS. I’m extremely grateful for you and your team.
My oldest son has 4 children 7 years old and under. I would like some examples of how to help them with their mental health. I find it difficult to communicate the model on their level.
Honestly, I need help communicating effectively with my 15 year old as well. When I talk about goals, thoughts, feelings etc… I get the crazy look. I’m not expecting him to jump on board with me. I would like to give him a good foundation. TIA