In "The Million Dollar Bond Robbery", we were introduced to Esmee Dalgliesh. She worked as Mr. Vavasour's secretary at the London & Scottish Bank. By the end of that 'Poirot' episode we learn that she would soon be known as Mrs. Philip Ridgeway.
As we never met any of her blood relations, we can make the assumption that she was also the dear old Auntie of Commander Adam Dalgliesh, as played by Roy Marsden... at least in Toobworld.
As the Trickster once said, "Reality is boring, that's why I change it whenever I can."
I'm just "The Man Who Viewed Too Much", and "Inner Toob" is a blog exploring and celebrating the 'reality' of an alternate universe in which everything that ever happened on TV actually takes place.
Most of my theories about the TV Universe come from thinking inside the box and thus can't be proven. But I've never been one to shy away from a tall tale.....
Remember: "The more you watch, the more you've seen!"