I was looking for information on a lady I thought was a sister of my ancestor. I requested her obituary, hoping it would provide information on her family and her origins. It listed the names of two children, but no details of where they lived or anything. The obituary was full of nice lovey-dovey sentiments, but nothing I could use to further my research.
Her husband's obituary was a different story. It was full of information on his children (some of whom were by a different wife) and other details about him that might help me locate more information about the wife.
Don't neglect those spouses of ancestral siblings. Their records may contain just the clue you need.