This movie is one I saw as a very young girl. I was home from school, midday matinee was on one of our two channels. 🙂

Around 1970..A family is at the lake or live at the lakeside…two sisters, sleep in bunk beds. The younger sister sleepwalked, and was getting all the attention, older sister resented her. One night she sleep walked out onto the dock, walked off and drowned. The older sister stood there and let her die.

One of the scenes, she leaned down over the bunk and told her to go to hell, I remember it being shocking, first Id heard a swear word on TV. I might have been 7/8..Ive searched cbc archives, all the other sites..Have a strong feeling it was a Canadian movie for some reason.  Spark anyone’s memory?