Answer
The cost of living cannot be properly compared across countries based on prices alone. Income, quality of healthcare, safety, climate, infrastructure, availability of services, and personal lifestyle must also be taken into account.
The same price can mean different value. A cheap country may involve more day-to-day compromises, while an expensive one may offer stability, services, or safety that matter more to a family than differences in the grocery bill.
A practical way to compare is to create your own basket of expenses: housing, food, transportation, communications, healthcare, school, household purchases, and a contingency fund. Then compare it not with an abstract notion of “high costs,” but with your actual income and the standard of living your family wants to maintain after moving.