I will join the chorus of saying "Don't meet with the elders." You showed so much to your dad and he would follow up to be sure you met with them to show them the same things. And a computer slide presentation is a sure ticket to a judicial committee or at least a forced disassociation. Just insist to Dad that you are okay just leaving it be.
Part of fading to keep family relations is to know where to stop. Your mom was receptive to at least allowing you your point of view, but Dad not so much. So you may have to tell him, "I don't want to see the elders, but I will stop trying to show you my point of view, and we can just be family without this between us." You can probably literally lay it out for him. "I don't want to get disfellowshipped, I just want to be a family."
Other than not meeting with them, don't worry that you might bump into them or they might try to trap you into a meeting. Refuse to say anything beyond "I am fine" and chit-chat stuff. The moment any JW tries to get you into talking about Jehovah and meetings and YADDA YADDA, just go back to "I am fine. Call you if I need to. How about that [weather/sports team]?" They only have power over you if you give it to them.
Edited to add: Probably need to do the same with siblings as with Dad. Try "We don't need to talk about this" and then don't talk about the religion. You might still lose some people over your fade, but it's on them, not you. At least by ceasing to talk religion, they may be receptive to you in years to come when family needs to reach out to each other over family deaths, illnesses, weddings, etc.