One more re the father-in-law. We also learned that if he doesn't consider the fare delived by "meals on wheels" on a given day to be tasty enough, he will probably pour bleu cheese salad dressing on it, whatever it may be, and chow down.

No, he isn't at all senile. He's just someone who has always been very much his own individual, and certainly isn't any less so at 92 years of age.