My mom used to buy some store bought eggnog (which, 40 years ago, was probably better than the current offerings), doctor it up with some spices and then add a fifth of Dewars Scotch Whiskey. That was to appease her uncle and my father. Dad didn't drink much but when he did, it was Dewars. That's the eggnog I remember from my youth, cannot drink any other type now, even if I wanted to. My grandmother would have some at 10 AM on Christmas morning.
Her uncle was one of those guys who had a scotch in his hand when he came in, drank some through dinner, took a nap after dinner, and then went home. He had a colorful history, having run booze in Florida during prohibition. This is the guy who first let me shoot a gun. I think it was a 12ga Stevens 311, I was about seven or eight and it knocked me on my ass.