TFP wrote:
A mild compromise I suppose might be to split the money four ways, a quarter each for the three cousins and the remaining quarter to be split equally between their kids.
This is a very gracious solution, I would never have thought of it.
At the same time, take note that pushy people thrive on getting an inch. I also suspect any compromise might be too late now damage is being done between the cousins!
In a similar situation, someone in my family stood firm and made sure no-one was steamrolled, even though he personally didn't care about the money (it wasn't a lot), so think carefully about doing what is right, i.e. your Great Aunt's wishes.
Good luck, & let us know how it goes.