My mother was given a recipe for beef curry by our cook when she lived in Malaya over 50 years ago. It lists all the separate spices and quantities. I still make it and have passed it on to DS who cooks it for his family.
When my MiL died, my DD, then aged 9 was so sad because she would never have one of her casseroles again. Some how since then we have marked passings by remembering the recipes we consider their signature recipes.
As I said, for my MiL her casseroles, my DM her curry, DF his pork meat loaf, An aunt, her soggy fruit cake, (I can never get it soggy enough), my sister, her pasta recipe.I suppose in some years they will be deciding on mine. I might just ask them tot ellme while I am living.