Parent/child in surface models works a little differently than one might expect. The last feature that adds to the surface manifold takes 'possession of the manifold. It is the only feature that contributes to the manifold that you can select from the feature tree to 'show' or 'hide' the surface body, and it becomes the name of the manifold in the surface bodies folder.
However, knitting two surfaces, adding a fillet to a manifold (and possibly other edits), while taking possession of ownership for the manifold, will not change the name that comes up when you use a RMB>parent/child search on one of its kids (specifically surface trims, but perhaps more).
Because it has an on-screen interface, to edit a surface trim you have to be sure that the actual parent surfaces are 'shown' in order to pick new pieces to keep in the edit dialog. To do this, you have to roll back above the trim, show all the surfaces that contribute to the trim, then you can roll down and edit the trim. Because a review of the RMB>parent/child for the trim will not, in all cases, give you the real name that you must find to 'show' any parents that you might have hidden that now lurk anonymously in the tree, you have to go a different route.
Tip1: To see if all of the parents of a surface trim that show in the RMB>Parent/child dialog are the actual parents you need, RMB click each in turn in the parent/child dialog, click 'go to...' , RMB click that feature, and see if 'show' or 'hide' is an option. If so, you are golden and can work with great piece of mind, knowing they will be easy to find when you need to. If not, you are in a little doodoo.
Tip2: To find the names of the ACTUAL feature you need to show the manifold, you can edit the surface trim and note the real names for the parents. It is curious that SW shows different parents in the dialog than show up with a RMB search.
Tip3: I go back and make sure to edit the name of the feature that 'owns' the manifold by adding two asterisks to the beginning of the name - it sure makes these critical features easier to find in the tree or in the list of surface bodies.