A Horrible Plan

So my sister calls me last night and tells me that she will be meeting the family for Thanksgiving in Columbus Ohio and then I start telling her that our other sister and I will probably drive together. There is a silence for a moment or two and then she says "oh..... I think Mom rented a van for all of you and our grandparents".
I am pretty much speechless that not only does my mom think that driving together for 7 hours in a van is safe, but also that she deliberately hid the plan from me because she KNEW it was a completely bullshit plan.
My sisters and I are in our late 20's, but are not above buying excessive amounts of snacks, singing aloud, and fighting during any sort of car trip. This presents a problem when we are in the presence of our esteemed grandparents.....
I told my mom I would rather cling to the bottom of the van than ride inside it.