public Collection<FidHashQuad> getParents() {
		return parents.values();
	}
Container class for the neighborhood of hashes around a function.  Contains
the FidHashQuad for the function, for all its parents (callers), all its children (callees),
and all the names of the children whose hashes could not be resolved.
Ghidra/Features/FunctionID/src/main/java/ghidra/feature/fid/service/HashFamily.java