And, bless him, he measures by fingers!

I learned to cook from my maternal Grandmother (German- family moved to North Dakota pre-WW1) mostly. Never considered using a measuring device for the most part until I started my baking career with a series of disasters....
All American Potato Salad
2 large eggs (optional)
2 pounds (4 medium) Yukon Gold Potatos
3 tablespoons dill pickle juice
1 tablespoon yellow mustard
1/4 cup finely chopped dill pickles (dill pickle relish is a quick sub.)
1/2 cup Mayo
1/4 cup Sour cream
1/4 cup minced red onion
1 rib celery chopped fine
1/2 teaspoon celery seeds
pepper
If using eggs - boil, peel, and chop coarse.
Cube and cook potatoes in 4 quarts of water with 1 tablespoon salt and cook for 7-10 minutes. While they are cooking combine 2 tablespoons pickle juice and the mustard in a bowl.
Spread Potatoes evenly on cookie sheet and drizzle with pickle juice/mustard. Let sit until warm (or totally cooled)
Combine the remaining pickle juice, pickles, mayo, sour cream, onions, celery, celery seed and 1/2 teaspoon of salt, and 1/4 teaspoon pepper in a large bowl. Add potatoes and gently coat in dressing.
Cool 30 minutes to a day. Stir in eggs before serving. Check seasoning.