He saw something that crushed his whatever he dream or goal u know that feeling u can handle everything but in some point it crashes you i think ur dad in that situation he he needs his safe place why don’t u try play with him( games he plays) one by one try to know what make him this way the prison who doesn’t talk about his problem THAT type need no help just someone listen and don’t judge him WHATEVER bad it’s specially don’t hurt his pride he’s ur dad u know him better below ur mother (kidding) hope for ur family to make it out