Not entirely relavent but an interesting fact (but morbid) I picked up.
If you die at the same time (e.g. a car crash) then it becomes important who’s will is read first.
e.g. your will says I give everything my surviving family, her will gives everything to the donkey sanctuary. If her will is read first then her 50% would go to the donkeys, then the remainder to the kids. Vice versa would give your 50% to your wife, then imediately to the donkeys, not the kids.
The way arround this is an assumption that in the absence of any evidence the older person died first. The important point being that you make sure the will’s do what you want them too regardless of which order you read them.