as usual, the answer is: "depends on...".
We don't know anything about the model, the feature tree, and how the relationship was build. Maybe the second feature uses a planar face of the first for it's sketch. Or a dimension uses an edge. Some sketch entities could be perpendicular, concentric or whatever. Don't really know.
So please check for the sketch reference plane.
Have a look at the external references of the sketch entities.
And then have a look at the feature itself...
(Or upload the model oder at least a screenshot of your FeatureManager).
I guess the simple answer is that you need to remove whatever relation there is between the features. Without the file it will be very difficult to be more specific. Can you post it here? See How can I attach a file to a forum post? if you aren't familiar with the process.
You can always use the ''Display/Delete relations'' tool in a sketch to find out if there is a mate linked to the other sketch. My guess is that is it. Go to external and you'll have a good glimpse at what could cause a child/parent link.
My guess is ''Face-Slot-Runner'' had a hole that needed to be bigger and ''OD-Hole-Cbore'' is mated to one of those slot. Either remove the slot and position the O.D. hole CBore or remove the mate and manually position the hole instead of having it mated to the other.
well I posted with the model itself as an attachment but I don't see it here. Hmmmm...I wonder where it could be.