Barb, I'm so sorry to read about your dad. I agree w/kml about "Joan". I recently saw similar behavior in a woman at the local nursing home who became very attached to male patient there. They get very angry when things aren't to their liking and nothing pleases them and they become overly protective of the person that they think they are partnered with. Her behavior isn't helping your dad's situation and he definitely needs peace and quiet in order to rest.
I'm so sorry about Chuck. He's a piece of work and doesn't realize or care that he has wonderful children and won't or can't recognize all that they've accomplished in their lives. Such a shame.
I'm glad you and Josh found each other because you both can be there to support each other through the good times and the bad times. I do hope that you and your family can find a way to settle down and enjoy life a bit more as a family.
Please take care of yourself.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.