Junior's mom and dad
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Although the parents care about their son, they are secretly desperate to get some time away from him. Due to their limited appearance in the episode, information about them is sparse. The mother appears to be the dominant parent of the two, as she does almost all of the talking, with the father only having one line.
Later on, when the mom and dad come back, the mom finds Junior taking a bath. She assumes that Mario and Luigi did such a good job babysitting her son, that she desperately asks them if they're willing to babysit the following Friday.