Hi Mike M,
Welcome and thanks for sharing this rifle and it’s history.
I don’t see any features of this rifle that makes me think of a particular maker. It looks to have been sporterized in the pre war style but I would guess post war. Is the grip cap plastic? Hard to tell from the photos.
That’s one person’s thoughts. There’s a lot of knowledge here and someone else may chime in.
I agree with Mike that it’s great to have a piece of family history with the story to go with it. I recommend documenting the history and story to pass along with the rifle.
-Tom