Final answer:
Disagreements and suffering arise from the rigid application of European international system's values of sovereignty and self-determination when they lead to conflict, and from the inflexibility of belief systems that ignore inconsistencies and fail to adapt to new realities.
Step-by-step explanation:
The system created by the grandfather and the grandmother in the context of this discussion refers to differing worldviews and the organization of society, particularly in the domains of international relations and belief systems. The 'grandfather' could symbolize the European international system, characterized by sovereignty, self-determination, and liberalism, while the 'grandmother' might represent non-European systems with different socio-political dynamics. The European system's focus on state sovereignty and non-interference, ironically, has led to disagreements and suffering, manifested in wars and genocide, as it often prioritizes national interests without regard to others. This is contrasted with non-European systems, which may have allowed for a balance of independence and interdependence, suggesting possible less war-prone scenarios. Furthermore, rigorously maintained belief systems, when faced with reflective criticism, may lead to conflict as contradictions and inconsistencies are grappled with. Thus, conflict arises when systems or beliefs rigidly dictate conditions, leading to disparities and suffering when human experiences challenge their coherence.