Well we managed through my dad's 90th birthday party! Not that it was all that hard or time consuming--we had a great turnout.
It took him awhile to realize that it was his birthday party---partially because his birthday isn't for a couple of weeks yet and because of his dimentia.
However once he did realize it, he had a great time, but was embarrassed that it took him so long to figure things out.
4 years later...
2 months ago