Son Wikipedia open wikipedia design. The Simple English Wiktionary has a definition for: son. A son is the male child of a mother and father. The opposite of a son is a daughter. If the child has siblings then the son is a brother. This short article can be made longer. You can help Wikipedia by adding to it. This page is based on a Wikipedia article written by contributors (read/edit).Text is available under the CC BY-SA 4.0 license; additional terms may apply. Images, videos and audio are available under their respective licenses.