to take dad, or not to take?

This Shabbat is my nephew's Bar-Mitzvah.

We've been planning this for a long time (almost 13 years...).

We've been planning the logistics of taking my parents for the past few months.
We kind of have it worked out.

But now someone raised the idea of not bringing dad along at all.

'He won't understand what's going on'.

'He won't remember there ever was supposed to a Bar-Mitzvah'.

I disagree.

Dad, as much as he doesn't understand and doesn't remember, he still has flashes of clarity.

If he does have a clarity flash, he'll be utterly insulted. And rightfully so.

True, it's tough on us, but I don't think we have a right to deny him of participating in a family simcha.