FITCHBURG — When she learned the mother of the man she had married needed a kidney, Erica Arsenault immediately volunteered to find out if she were a compatible donor. It is something anyone might do for family. Except Dorothy Wolferseder was no longer family. Her son, Scott, and Arsenault had been divorced for years. They had maintained civil relations, raised two boys, but no one, not Scott, not Dorothy, would have expected Arsenault to be the one to step up.
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