Do all family members need to appear at the immigration office for a visa extension in Thailand?

A family of four is seeking information about visa extension procedures for their two children ages 4 and 7. They want to know if it's necessary for the entire family to go to the immigration office for the extensions or if one parent can extend for everyone. Additionally, there's uncertainty about whether children under 15 need to appear for the extension, as they read that kids may not be required to extend. The community responses clarify that all family members needing an extension must attend, though kids are not exempt and could receive an overstay stamp if not extended.