Dependent
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
A dependent is a person who either derives more than one-half of his/her support from another or is under the custody, control and care of another. In instances where there are conflicting claims for the dependent status of a person in more than one household, the household of the person having custody, control and care shall be determined to be the household wherein the person is a dependent.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.