My other theory is a drug binge. And this one I base on personal experience with a relative.
This family, close relations, always presented themselves as better than everyone else. They would put down relatives, criticize their habits, housekeeping, child rearing, etc. Relatives were often discpuraged, quite coldly, from visiting. There were a few odd incidents over the years. Wife went out on a girls night and came home with a black eye and broken arm. Got tipsy, apparently, and fell in the bathroom. She got migraines, and called me one evening when she was having a severe migraine to see if I had any old pain meds she could have. She lost a job or two, reasons unclear.
Turns out she was a complete drug addict. She would disappear on binges, was in and out of rehab, lost jobs because she stole money, tried to get the refills of meds prescribed to relatives. This all came out when they lost their house and had to move in with her mom. She died a year or so later. They raised three daughters, the oldest as a teen told her father to leave her mom, throw her out of their house, repeatedly. It was very, very bad and they hid it very, very well.
So.... some people will go to extraordinary lengths to hide drug abuse and present their family as perfect when the truth is very different.
Maybe a drug binge, and a cover story to "keep up appearances"
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