Have done alot with similar types of situations, can possible help. Often on one spouses profile you might change notes on the children, updates on born married etc. Found it was easy enough to copy my marriage/family section from one profile to another. Little cumbersome but works.
Second option works great are things like wedding photos, One photo linked to 2 or more persons. With comments appropriate to all those in the photo.
Another option big wedding party, create special page for this event. Might work for setting up something like family cemetery information.
May not be the answer your looking for, but willing to assist If I can, may need an example of a problem. Contact me if you wish. Lechner-18