Can I adopt my adult stepchild?

Yes — adult adoption (age 18+) allows a stepparent to legally adopt an adult stepchild at any age. It is simpler than minor adoption: only the adult stepchild's consent is required, no parental consent is needed, no home study, and no background check. Adult adoptions typically finalize in 4-6 weeks. The cost is the same $349. Adult adoption creates a full parent-child legal relationship including inheritance rights.