Thank God for Marijuana!!!
If there ever was a god-send to help numb one's mind to help deal with a parent with dementia it is MJ.
Getting high helps relieve the edge of what seems like such a huge waste of time (answering the same questions over and over) and not allowing it to drive you completely off the cliff of sanity.
When you are high you can smile and laugh and forget about the stress of it all, and that things are only going to get worse, and that you have dropped everything else in your life which you would rather be doing (like making a decent living).
Hanging out with some one with dementia sucks the life out of you unless you are getting paid for it, or if you are happily high. or i suppose you can stay stone sober and try to fake being happy and just suffer through praying for the end (not a very nice thing to do).