While her older sister was taking care of stepmother, her husband, stepbrother, was afflicted with a woman in her office.
Several years later, stepmother died, but it seems he handed the envelope to my sister shortly before his death.
It is quite thick thick envelope outside the fixed form, he says that he said "Open yourself if you are taught."
"The letter that was in the envelope seems there was a word of apology saying that it was better to divorce quickly and open up a new life, if it was true, but I let you lose the timing of divorce for myself".