Shingo's mother is a minor character in Lassie.
She's the mother of Shingo Yaguchi and wife of her late husband
A year before, her husband had died. So when her son Shingo manage to faught off some bullies, she didn't think twice to help him find the dog that helped him. They found the Collie and fixed his pendant. They also figured out his name was Lassie, like the famous Collie she used to watch as a kid. But when Lassie got lose to help his friend, they searched everywhere for him. After she was done at work, Shingo told her about a wounded German Shepherd that Lassie had showed him. They took him in and named him Roku, and Lassie went off to find his owner.