My dad can’t stop & doesn’t care to stop watching & participating in some virtual porn world that he has basically helped create & because of this he feels that he needs to stay attached to this fake world no less than 16hrs a day! He’s retired so he has time but my mother has gotten the most fallout because of his addiction! We can’t tell him anything without him becoming very upset then just walking away!? It’s crazy, and we (mother & myself) don’t know what to do!?

Interesting subject, but how did you get with it on this forum I wonder?
Generally there is not much to do except for pointing it out in front of him and specifying the negative effects it has on you.
The only person you have control over is yourself. Think how you can act to make this less of a problem to you, besides letting him know about it.