Re: road trip but with issues
Her kids and their needs are her and her husbnads problem. You are not responsible for them. Why are you so worried ? you are already ruining your fun by bieng so peeved up with the things which have not happened as yet.
If it was a homeless family and needed some help then you will have moral obligation to help since you can , but for holiday programs everybody is on their own.
At the most since your dad is worried about her sister and her family’s well being then let him worry or take care of it all if he wants to.