What would you do?

So, my mom called me today telling me my grandma wants to come see my uncle today and tomorrow. We both live in the same town and 4 hours away from my mom and grandma. My husband and i had already made plans 1 week in advance to go to a waterpark on saturday (30 minutes away) and she knew cause i told her. We have 2 kids and its already hard enough to have extra money for a date, have the time, and find a babysitter who can watch 2 kids (4 yrs & 1 yr). Now that my mom is coming i dont know what to do 😣. I feel bad if i dont spend the whole day with my mom but we had also been looking forward to this for a long time but i also dont see my mom alot. Also, we have a BBQ today with friends which was also already planned so i dont know if ill see her for along time since i dont know when they are actually coming.

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