When referring to children under the age of legal majority, the term "minor children" is commonly used. However, there are other synonyms that can be used in its place. "Juvenile" is often used in legal contexts, while "underage" is a more general term. "Minors" is another common synonym. Other terms that can be used include "youngsters," "kids," "juveniles," "adolescents," "children," and "youths." It's important to note that the specific synonym used can depend on the context in which the term is used and the level of formality required. Regardless of the word chosen, it's essential to use respectful language when referring to children.