Like you whitewave, I really enjoyed this drama. There is so little quality drama on television these days - programmes that make me think and consider how other people sometimes have to live - with hardship and unhappiness. You are so right about the constraints of the 1950's. My parents divorced in the 50's and it was an unmentionable subject. I was so embarrassed at school and didn't want any one to know. There was no support for children. If you couldn't talk about divorce, you certainly would not talk about how you saw your mother drown. The poor boy must have been in torment and no one saw his unhappiness.
I think he may be going to form a good relationship with the young girl from the other family - well, I hope so!
I enjoyed all the furniture, clothes and hairdos of the 50's - even though both families were obviously quite wealthy. (I noticed a radiator - gosh, we didn't have those!).
I checked out the author on Amazon, and think I will try one of her other books - certainly this is a story not of the usual Sunday evening drama.