Ed Haywood
En-Route
Not a logical explanation for the behavior.
Behavior is not logical, ergo there is no logical explanation.
Many times it is health. Dad gets old, gets sick, and can't fly anymore. Nobody wants to admit he is never going to get better, so nobody pushes the issue. Eventually he winds up in a long term care facility. Dad was the only pilot in the family, nobody else has a clue about planes, so it sits and deteriorates until he passes away and the estate gets settled. By then it is too far gone.