I am an only child too and think about this sometimes. My mom has overcome Hep C and a bout with possible lung cancer while I lived away. I never did get a chance to visit her in the hospital. Luckily, she is still married and her sisters and brother are very close. I don't feel the burden, even though I'm 9 hours away because there is so much family that I left behind.
Do I feel guilty? Yes. In a perfect world you wouldn't feel it or have to worry about this stuff.
I don't have any advice as I don't feel put upon by either one of my parents. Good luck to you though. And continue with those boundaries, in-laws can put much pressure on a marriage.
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Whatever did happen to your soul?
I heard you sold it
Choose Heaven for the weather and Hell for the company
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