I use LR on Mac ( we only have Macs) for editing and really like it. However, my family wants to view, share and possibly do some minor editing of the images as well. LR seems to be way overkill for their needs and they use their own logins anyway. I know it will mess up LR to have the images moved or edited outside of LR.
How do others handle this set up?
Consider using Lightroom Mobile. This way you can share collections with them which they can view in web browsers or even on Apple TV. If you enable downloads for a collection, they can download a JPEG version and do their own edits.
You cannot share and sync single Lr catalog on different computers, The best option would be to use Lightroom web, Refer Learn to use Lightroom on the web