Went to Ypres with my old man, 2013.
Battlefield Tours.
Can't remember all the places we visited, but those trenches, mini museums etc, was one of the most moving and evocative things I've ever experienced.
And the last post at the menin gate, well, speechless.
Like you say, those cemeteries etc, unless you see it yourself, it's hard to comprehend.
Just to add, and with you having a family involvement, it'll mean more to you.