Yes, as Hendrik says, you probably have restrictions on your top level "Family Photos & Videos" item.
If you added the "Family Photos & Videos" item as a "Root Library Item" or just "Library Item", you are able to "Set rules for file display..." at that level, and hence restrict what gets displayed at lower levels.
If you added the "Family Photos & Videos" item as a "Category" and selected "Main Roller" or "secondary Roller", then you would not have been able to "Set rules for file display..." at that level, and hence there would be no restriction on what gets displayed at lower levels.
Given what you are trying to do, I would suggest that your "Family Photos & Videos" item should be a "Category" and "Secondary Roller" item, to be consistent with the default "Video" item. Playing with the setup in Options, it isn't obvious to me now what the "Primary Roller" would be used for, since none of the default items use it, yet they appear at the top of the menu structure. I can't see any way to best either a "Primary Roller" or a "Secondary Roller". The option is never active. Also the "Audio" item isn't a Roller at all, but is a Library Item. I guess you can use a Library Item at the top level when you want to apply a restriction at that level.
"Video" can't have a restriction at the top level, because it contains a mixture of items Media Types within it; DVD Drive, TV Channels, various sub-types of Video, plus YouTube and Video on Disk Drives.
As your "Family Photos & Videos" will contain Video and Image Media Types, it should follow the convention of the top level Video item, as above, and be a "Category" and "Secondary Roller" item. Then build the specific "Home Videos" and "Pictures" items below that, and the detailed views below them. I built that arrangement in my library and it worked fine. I may even keep it now, although the name is a bit long. I might just call it "Family", with "Home Videos" and "Our Photos" below that.