This is sad. I have a similar problem, but just with a single person- my mother. And in my case, it is not contemplating a radical life change to search for happiness. I just cannot speak my mind totally.
You have found a way to speak your mind to your dad, but you know you cannot keep doing that. I have found a way to speak my mind to my mother and I know I cannot keep doing that. I go on, Mom pretending everything is okay.
Let's try to think- what is the "happiness" you would find sailing away and disappearing? You would run out of money or supplies. You would be alone anyway. What do you really want? If you want a social life that includes your wife, family, others that know JW's don't have the truth, it's never going to happen. NEVER- until Mom, Dad, Wifey leave the WTS. So you really have to choose one or the other or live in the "separate" lives situation indefinitely. Leaving it all behind is something you have been avoiding. You really want those family members around you, otherwise you would have pulled the plug. You even wanted the JW's to make the decision for you, but they wouldn't DF you.
If choosing one or the other makes you miserable because of the damages it either does to you or to them, then my recommendation is to hang out in the limbo of the separate lives thing and wait to see what opportunities you have. I know it ain't the answer to end all answers, but to lose family members over the cult is just too over the top. Read Steve Hassan's RELEASING THE BONDS. Read David Reed's HOW TO RESCUE YOUR LOVED ONE FROM THE WATCHTOWER.
I had to ease up on replacing my special purpose in life with a new special purpose. The WTS gave us a special purpose to proclaim the good news, help people to gain everlasting life, and sell magazines. When I realized it was really about the "selling magazines" more than anything else, I replaced that special purpose with a new one to get my wife out of the cult. I admit that one didn't succeed, but I also had to let up on it because I needed to move on. But until I needed to move on, it gave me a focus. Maybe you can do that. Focus on what you CAN do instead of how life sucks. After a year or three of focus on rescuing your wife and loved ones, you will see other things in life to focus on- or maybe you will even have a measure of success. I would stay in contact with loved ones and not sail away to never-never land. Just my opinion on a tough life.