For eight years, on the first day of every month, I sent my parents exactly $2,000.

No reminder.

No complaint.

No missed payments.

I was 37 when it started. I had a good job, no children, and a modest but comfortable life. My younger sister, Melissa, had three children and a husband who drifted from job to job. She was always “going through a difficult time,” which somehow meant everyone else was expected to make sacrifices for her.