Undocumented migrants can marry and can register the births of their children. In all contacts with municipalities, they need their personal documents like passport, birth certificate etcetera. Be aware that a legal family member doesn’t automatically legalise the undocumented migrant himself.
You will find useful for contacts that are national wide as well as local to your city.Below are the locations of organisations in the Netherlands from which you can find and locate. By hoevering over the organisation you will be able.