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Gabby When my sister and brother-in-law agreed to chaperone a school trip to another country for my niece and nephew, I assured them I'd be okay while they were gone. I'd been living on my own in a different city since I started college several years ago. I was in the middle of my last semester of school and couldn't take the time off to go with them. My sister gave me her friend's phone number and told me to call him if I needed anything while they were gone.

I agreed to her request and to...