Guys, calling 911 isn't going to help. Their is nothing the responding EMTs or paramedics would be able to do on scene. Best case scenario is they would transport him to the hospital to get looked at. However worst case scenario, and the most likely to happen, is his dad refuses treatment.
Just because we show up doesn't mean they have to come with us. I was on a call where a father of 5 had an irregular and potentially lethal heart pattern. Despite this he refused to come with us to the hospital. The responders would show up, make sure he doesn't have any immediate life threatening problems. Then they would make him sign a patient care refusal form and leave. Sorry, but calling 911 isn't the solution.
Anyway, I'm sorry Nal. If I were you I would just try my best to convince him to go. Even if he doesn't want to do it, ask if he will at least get checked for you and your family.