On my phone. Sorry for the formatting. 
First time posting here - long time lurker :)

My family has a social event this weekend in another town. It’s a 2 hour car drive from our city - which admittedly isn’t much, but my father is usually the one who drives and he always gets exhausted after these kind of trips - he’s quitting smoking and his body is aching all over, plus he’s not that young (55yo). 

Anyway, the event is on Saturday and my dad told my mom that he wants to go Friday night because he’d rather be well rested for the day of the event. My mother agreed - she’ll be there already, she goes tomorrow because she teaches in the University there - so my dad will be driving my sister and my two aunts (mother’s sister and mother’s aunt). Let’s call them Aunt 1 and Aunt 2. 

And here comes the problem... Aunt 1 (mom’s sister) wants to go Saturday - and around 11o’clock, despite my dad also saying that, if they had to go Saturday, he wanted to leave at 9 am at the latest. Mom still didn’t tell Aunt 1 that they’re actually going Friday night, and since mom travels tomorrow, she’ll likely not tell and leave the issue to my dad. Aunt 1 is struggling with depression (she was on antidepressives until last year, quit taking them for reasons we don’t know and only now resumed taking them) but she’s frankly been a nightmare lately. If anything doesn’t go her way she throws a tantrum and raises her voice and gets kinda mean. Because of that everyone’s afraid of telling her the “we’re going Friday” thing. 

I was keeping to myself - I’m not going, so I figured it’s none of my business. But now Aunt 1 is telling Aunt 2 that they’re going Saturday around 11am, which isn’t true at all since nobody told her that - she just assumed that, since that’s when she wants to go, that’s when they’ll go. I want to just tell her the truth already because it’s not fair to my dad, but I’m afraid that this isn’t my place. 

Wibta if I didn’t wait for my mother and just told Aunt 1 that they are not going Saturday, much less at 11am? 