Goodmorning and congratulations on your first post.
That's a very nice album. A little treasure.
However, what makes you think this belonged to a royal?
Are there any names?
My initial impression is that the album belonged to a upper middleclass family.
The uniforms of the two soldiers are post 1848, more likely post 1864 and they depict a cavalryman and most likely an infantryman but as far as I can tell they are not officers. - The vast majority, if not all, of those whom the DRF would associate back then would have been officers.
All sons of the middleclass would also have been conscripted as privates back then.
The other prominent young man looks like he had his photo taken on the occasion of him being ordained priest.