When Carol and Theresa's mom was diagnosed with early-stage Alzheimer's and their dad's vision started failing, the news was met with some denial -- and their parents' groaning aversion to leaving their home of over forty years. The sisters, one of whom is my mother-in-law, came to realize that they are now parenting their own parents. In coming to terms with this they also realized that they each need support too. The result is an inspiring and positive arrangement. They've become "co-caregivers."