Wow, no grad ticket AND change our vacation plans?

We made vacation arrangements to see my stepson graduate this spring. We were going to their state for a few days for his graduation and visit my family and then after the graduation ceremony, we are to drive north to visit my husband's parents (we haven't been there in three years). My SS finds out we are heading north to his paternal grandparents and asks to go with us.  I was a little surprised (figured he'd have grad parties to attend) but OK, no problem, sure.

A couple days ago, SS informs his dad that he has plans with his friends and wants us to wait a few days to head north because he wants to hang with his friends. Nobody required him to go with us; he asked to go. We are driving from OUR state to theirs, taking work vacation time, dog sitters, etc., but we should change our entire vacation now - extend it - to accommodate his hanging with friends (when he hasn't seen his dad in two years because those friends are more important than coming to dad's house)?

Yesterday, I posted about how dad wasn't even getting a ticket to see his son graduate from high school this year from the ex. We were informed of this on Easter Sunday, obviously after we made vacation arrangements with work, dog care, etc. So, now they won't give us even one ticket for dad to see his son graduate and they still have the nerve to ask us to rearrange our vacation, which we planned around that damn graduation, to suit him?

Really?

Oh.My.Gawd. The world does not revolve around one kid - whether their parents are together or not. HE asked US to go; not the other way around. Adults in the real world have responsibilities - jobs, bosses who expect them back after vacation is up, etc.  Our own kids are putting their teen lives on hold for this family vacation.  SS asked US to go, not the other way around.  I understand completely wanting to go to grad parties and stuff, which was why I was surprised he asked us to begin with.  However, don't ask to go and then turn around and ask us to change all our plans to suit him!

Of course, my husband is now trying to figure out how to accommodate his son without ticking the rest of us off.  Yeah, good luck with that.

Instead of calling his son on the fact that they aren't even giving him a ticket to see him graduate and yet he is still asking him to rearrange our vacation for his plans, DH is trying to figure out how to make it work.  It won't. I don't know how long it will take DH to figure that one out though. Probably after he ticks me off beyond reasoning.