This section is from the book "Popular Law Library Vol4 Torts, Damages, Domestic Relations", by Albert H. Putney. Also available from Amazon: Popular Law-Dictionary.
The words child or children as used in law, always mean legitimate children. The word child is often used as denoting a person under the age of 21 years, that is an equivalent to the word infant. It is also sometimes used with reference to young children as in laws for the prevention of cruelty to children.