How can I help my father?

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My dad has been having issues back home with my Mom and sister and I really don't know how to help him.

Hes very narcissistic, lazy, and he fights with everyone he talks to nowadays. It's gotten so bad that he's cut ties with my brother, can hardly speak to my mom without triggering her (we're all in agreement that after everyone has moved out they'd split), my sister can't stand him, he's on the brink of being fired from an amazing job (for the 2nd or 3rd time) and he's currently on my shitlist as well for talkin' shit about me back at home.

Basically hes just an asshole but he doesn't realize it. I know hes also struggling because being a narcissist hes realizing that he no longer has control over anyone anymore (I moved out, my sister just graduated, wife wont listen to him and is close to finally leaving). He's just been a mess these past couple years.

He may be beyond my help but he definitely needs help. Hes been trying to buy a gun the past year or two and I'm afraid he may try to off himself.

Any advice on how to help an awful father get his shit together as he enters the next stage in his life?

>pic related. He sent this to me this morning. not sure what to reply...