Revit :: Container Family For Ancillary Objects?

In a real world, a wall will host a window. In turn the window will require a series of ancillary objects. The moment the window is removed, so are the ancillary objects. The ancillary objects dimensions such as length are driven by the window length. The referencing of the ancillary objects should reflect or know the window number. So there is this direct relationship. Windows to a facade come in all shapes and sizes, but the principle interface details tend to be the same.
 
It seems to me that the above could almost be achieved in Revit by having a window family and a container family that holds the ancillary items, whether they are 2d or 3d. Each container family contains a different set of ancillary objects to reflect the differences in wall types. Depending upon the window / wall interface, the appropriate set of ancillary items are selected.
 
To achieve a relationship between the 2 families it appears to me that the container family(families) would need to be nested into each window family defined within a project and then face up to the challenge of linking the various nested parameters. Perhaps a window template being built at the outset of a project containing this process - but this has an impact when working up legends.
 
It seems to me the alternative would be to locate the family and then locate the container family, going through the whole process of aligning etc as maybe required etc etc, plus the use of instance paramaters that are manually adjusted to reflect the window object.
 
I use windows, but this could easily be doors, rooflights etc.
 
What intrigues me is that currently there appears to exist a 'connector' but can only be used by MEP objects. Can this be utilised in some way to connect the 2 families together and act as a conduit for parameter information?