I was executor listed with my brother when my mother died. He signed a paper to release his duties so only I would do it, so both of us did not have to sign papers.
We had been both listed as POA’s and medical POA’s when my mother was alive. In that case either of us could have used it for medical or financial decisions. We split the work but sometimes we stepped in for each other.
In our will we have both D’s as executors.