I am not related to the Simonsens; but I knew a Simonsen family in Edinburgh in the 1940s and 1950s.
They lived in Bellevue Road.
"Sid" Simonsen owned the Crystal Ice Works at Canonmills, the buildings were probably based on or part of the original Canons' Mill from the 1200s, using the mill leat/lade built by them, as the supply of water for both freezing into ice; and also for part of the cooling process. The latter could be seen up at the back of the site as viewed from Rodney Street - a never-ending stream of water dropping down over the grid-work of pipes.
Most of the ice went to Granton Harbour for the fishing boats; and there was another ice works on the Middle Pier, along with the coaling plant.
Later, Mr Simonsen bought the adjacent Canonmills Garage in Rodney Street. His first car that I remember was a pre-WW2 Morris (Oxford?) KS7530. That was followed by an Austin (Devon?) GSG186, a Wolsley 4/44 with the first "cherished" registration I am aware of - MSG444.