I seldom went with my parents when they grocery shopped. I do know they had a list, and that there were impulse buys. The seafood department was usually impulse buys as you don't know what is really fresh, or what might be different the day you are shopping. They'd shop at two or three places partially because one was exclusively Asian, and they were big on Asian, and the other usual two would have either better deals, or the one would simply have better produce (with practically no housecleaning things) and so they'd go to both. I think they largely strolled around together, with Dad perhaps going off to the seafood area often by himself.
Dad took early retirement at 25 years of employment at his company. However, he went into business partnership with a fellow in Philadelphia, conducting business by phone and snail mail, and with some business trips. Prior to retirement, he cooked on Saturdays and Sundays (and holidays). Once he was in a partnership, he could make his own hours and almost always was able to work from home. (Mom became his typist. I became his periodic Spanish to English translator, and occasionally, with dictionary at hand, his English to Spanish translator, for some of the contract letters sent back and forth.) During the 25 years of his first employment, he didn't do the regular shopping, but he WOULD make time to go to Chinatown and to Little Italy in New York City on weekends - because cooking was his hobby. Mom always went with him, and we kids usually as well.
I am beginning to understand where your cooking talent comes from.