I love greasy spoons/diners as the food is filling and cheap. My family and I, including my grandparents, parents kids, etc etc. love to get together on a Sunday afternoon for some good diner food.
If you have any recommendations in the GTA that will be great! We live in Scarborough but will travel for great diner food. The kids can make a trip out of it.
I like Zoulpy's on King St West, just east of Sherbourne. I used to eat there a lot when I worked in that area.