Nothing wrong with the Caribbean Princess. Have sailed her several times with none of the Problems mentioned. None. Last time was 2 years ago. The only real way to find out the truth is to bite the bullet and take your current cruise. Enjoy.
Now comes the discussion on which dining room will be for what group? Then all the posts about those that do not like the assigned dining room for their choice. Oh what fun we will have with this.
Good luck with that. My daughter lives in Vancouver and teaches at BCIT. Both my parents had dementia and the later stages are not pretty. Enjoy them will you can and hope they enjoy the Hawaii trip.
Do they have internet on any type of electronic device possibly their phone? If so they should be good while in port in Hawaii. Not on the ship as that can rack up huge costs. Hope they have a fantastic cruise.