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This article examines Canadian family reunion DNA testing. Despite its irregular use, this procedure is considered a last choice, particularly for candidates from Africa, Asia, and Latin America. The study demonstrates that the Immigration and Refugee Protection Regulations (IRPR) biologically define "dependent child" in conflict with provincial psychosocial family definitions. Discrimination and privacy problems are serious social, legal, and ethical concerns. The authors advise further improving the last-resort strategy (DNA testing) and how it's implemented and redefining "dependent child" to include psychological family links to address these issues. They claim that the Citizenship and Immigration Canada (CIC) DNA policy's ambiguous scope and parameters lead to uneven enforcement and unexpected court outcomes. Clearer criteria and regular documentation are needed to aid reuniting families financially and logistically, according to the authors. They advise cost-sharing or saliva testing to simplify. They also propose a public DNA-testing handbook including permission, counseling, fees, and privacy. Immigration officials need greater training to administer the amended regulation fairly and consistently. The DNA testing method must be simple, and anonymous data on use and findings would be helpful. Ethical safeguards including lab accreditation, secrecy, and sample disposal are crucial. The report also indicated that DNA testing might prevent a father from being deported if he can prove he has a Canadian citizen or permanent resident child. It may also prove a sibling marriage or a couple's marriage without a certificate if they have children.