<human>: My dad is 62 years old, a Vietnam veteran who was drafted and extremely emotionally stunted my entire life. In order to gain compensation for his PTSD, he had to recently go through some therapy through the VFW and was asked to speak about his experience in the war, which flooded him with repressed memories. He quit going to therapy and taking any medication (besides weed). Now, he is almost intolerable. He snaps at my mom constantly, acting as if he even hates her, and thinks she's a total idiot. He also treats my sister this way, but to a lesser degree. He gets along with me because he can teach me about being an artist, which is the only way he knows how to bond with his children- informing and teaching. Since my sister is not an artist, he doesn't seem to even like her anymore. He ruins all family outings, getting frustrated very quickly and snapping at anyone and everyone who speaks to him, including waitstaff at restaurants, people driving, etc. 

He goes to bed extremely early, and expects everyone to eat dinner with him at 3 pm (on weekends), during the week he is in bed before anyone even gets home from wherever they were. He is retired but has screenprinting to do during the weekdays, facebook addiction for all other times of the day. 

 I'm only 22, but I am the only one he will open up to about his issues and I don't live in the same state as my family anymore. I feel like I am mediating my family from 7 hours away, trying to keep them from falling apart and I'm failing at this point. Has anyone had experience dealing with a family member this way? I feel like I need to stage an intervention with him, before my mom kicks him out.

Can you summarize the given text in a few sentences?
<bot>: My dad suffers from PTSD, won't get help, gotten stronger with time. My family is almost fed up with him and I am not sure what to do to help from 7 hrs away.