Might be a Morse episod, but not sure.....

I am trying to get the title of what might be a Morse episode, but I could be mis-remembering, and it might be "Touch of Frost" or "Wexford", or even "Midsomer Murders"😃

All I remember is that there are a couple of siblings of a well-to-do family who behave like overgrown kids and start giving it "boo hoo Mummy" when fingered for the crime. Apparently their over-boorish father had reduced them to quivering ninnies in their lives.

I thought it was the "Happy Families" episode from Morse, which had a boorish dad and a couple of sons who had never left home and seemed a trifle ninny-ish. But not so, as it turned out.

I would be thankful to anyone who can throw any light on this, cheers!