If you move to a country with which the Netherlands has no treaty, you will have to take out health insurance for your family members in that country. You are also not entitled to a European Health Insurance Card (EHIC). This also applies to the ‘Dutch Antilles’ (Caribbean part of the Kingdom and the BES Islands) and Suriname.
Do you live in a country with which the Netherlands has a treaty? In that country you will be entitled to medical care in accordance with the rules applicable there. You may be able to co-insure your family members. The health insurance fund in your country of residence determines that. You will then pay a healthcare contribution to the CAK for your family members. Read below what to do.