A kind is a child, plural kinderen. You may come across the term in wills, guardian appointments or other types of notarial and court records.
Children in Volendam. Credits: Bernard F. Eilers, collection Amsterdam City Archives (public domain)
About Yvette HoitinkYvette Hoitink, MLitt, CG®, QG™ is a professional genealogist, writer, and lecturer in the Netherlands. She has a Master of Letters in Family and Local History from the University of Dundee, and holds the Certification of Genealogist and Qualified Genealogist credentials. Yvette served on the Board of Directors of the Association of Professional Genealogists and won excellence awards for her articles in the National Genealogical Society Quarterly and the Association of Professional Genealogists Quarterly. Yvette has been doing genealogy for over 30 years. She helps people from across the world find their ancestors from the Netherlands and its former colonies, including New Netherland. Read about Yvette's professional genealogy services.
My grandfather came from Barneveld, Netherlands. He always would refer to his kids, grandkids, etc as Kiddies.