I never had collard or mustard greens as a kid, but it's an absolute wonder I still love spinach, peas, and asparagus because my mother always cooked them to death. Unless raw or lightly steamed/sauted I will not eat broccoli because of the way my mother massacred it. No green veggie was cooked unless the the water was green seemed to be her way of cooking veggies.
Ahhhhh, English cooking. I need to boil this some more, it still has flavour.
Your mother must have gone to the same cooking school. My mom was a great cook for everything except green vegetables. She boiled them all to within an inch of edibility.