It is a sad truth that not all appointed executors are up to the task. Some people are blindsided by the position, completely unaware their loved one chose them until the event of their death. Others think they can handle it but grief or an uncontrollable circumstance leaves them overwhelmed.
Having siblings has its good points and bad. If you were fortunate to get along with your brothers and sisters, you may have friendships with them as adults that you cherish above all others. However, if tension or rivalry existed among you growing up, those old resentments may be difficult to overcome.