My mother asked that my brother be executor of the will. He has a job involving finance, so he was the most qualified of the offspring to do the job. He is a very fair person and knows the will executor responsibilities.
Unfortunately, in some families, where the executor is a relative, he/she can get entangled in some real disagreements about property division.
I think before someone dies, they should specify as many of their desires about which heir this or that goes to.