It's hard to tell with out testing, but sour, tangy tastes are signs of excess acidity. Alkalinity taste bitter. And the irritation to genitals and nipples is a VERY bad sign. Either you take on caring for the grandparents' pool or keep your kids out.
"Gee, Mom&Dad, I found this GREAT site called PoolForum.Com that tells you ALL about how to take care of your really easily and cheaply! They have over 20,000 members who are expert in ALL kinds of things about pools, and they are ALWAYS happy to help. Would you mind if I took over caring for you pool so I can try out their methods?"
And order a good test kit--Ben's PS-234, the Taylor 2006, or Leslie's Chlorine FAS-DPD Service Test Kit, then USE it on the pool.

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