Photo one looks like a manipulated photo.
It would be an extraordinary occasion for so many weapons to be firing tracer from so many positions and a photographic miracle for it to be captured at exactly the same moment with even the best of the low light lenses available during WWII while still managing to capture any definition of the building lower right. I say this from my ancient experience in photography of the black and white film with negative type which is this sort of photo.
Moreover, most of the tracer trajectories are fairly low and not consistent with a bomber attack which has been attributed to this photo:
“21 juli 1940: The intense flak faced by aircraft attacking German warships (Admiral Scheer) in Wilhelmshaven on the night of 20-21 July 1940. No.61 Squadron lost three Hampdens during this raid.” http://www.dagelijksestandaard.nl/2010/07/dwarsdoorsnede-van-een-oorlog-21-juli/
Clearly there is no flak in the picture while the fireworks are at least 10,000 feet below the minimum likely range for flak.
It may be that this photo was a postcard or stock photo given or sold to German troops from whom your father obtained it, or one given or sold to Occupation troops like your father rather than one taken by him or his mates.
Unless, perhaps, and it’s a very, very slim perhaps, this was a major, major, major yippee shoot by Allied troops after the surrender.