DH and I live an hour distance from our hometown. We visit one weekend a month with DS. I always ask DH to make plans with MIL/SIL/etc and let me know when they are so I can work around them. He never does, and I get bored and fed up sitting in his grandad's house all day doing nothing, as does DS. So I usually give it till a week before we go, then make plans of my own.
DS and I are going to a sea life centre with my parents Saturday (I told him earlier this week and invited him! He's clearly forgotten this) and made plans for breakfast then softplay with DS's godmother and her son Sunday as she never really gets to see him.
DH has just gone off on one saying I should cancel my plans because he wants to take DS out with SIL on Saturday or Sunday. For background, SIL is pretty nasty. But she's nice to DS so there you go. She never visits, calls, or shows any interest until he's in town. Other than that it's like he doesn't exist. So she's clearly not really interested anyway. She puts no effort in.
The point is, DH never told me of these plans! So why should I cancel mine? I asked him five or six times and he hasn't made any plans! We have to leave by midday Sunday, so there isn't a lot of wiggle room. I offered for her to come along Saturday, but that wasn't good enough apparently 
and I want to take DS along Sunday, so he can play with my friends DS and keep him distracted so we can catch up.
I probably am being a bit unreasonable, but this happens every bloody time we go down and I'm just expected to drop whatever I'm doing to facilitate his lack of organisation.