Sometimes it can be tempting to focus on the spouse of an ancestor from whom we descend or only those spouses with whom an ancestor had children. That can be a mistake. Don’t ignore “short term” spouses or spouses with whom the ancestor had no children. There may be some clue that spouse’s life that helps you on the actual ancestor. That “short term” spouse may have had a connection with the ancestor than spans back years and may help you to learn more about your ancestor’s life as well.
Researching the entire family is advised, but we don’t always do it. I was trying to pin down information on an aunt, Wilhelmina (Trautvetter) Senf Kraft–particularly when she managed to settle in Illinois. It was not until I obtained the christening record of each of her grandchildren that I was able to do that. There as one of the sponsors for one of her grandchildren was Wilhelmina. It helped me to pinpoint when she had arrived in Illinois.  
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