MOND-018 Aunt Became an Appreciation Doll

A letter arrives to a young man who was punished by his grandfather in his childhood. The sender was the young man's aunt, the daughter of her grandfather's mistress, who was close to her age and called her sister. The content was that her grandfather had passed away and that he should return to his hometown. The sight that the young man, who made up his mind to return home, witnessed at his parents' house was unbelievable... What is the truth that the young man witnessed?