Yes. You share DNA with your biological relatives, so some of your results may also be relevant to them, even if they have not taken the test.
If you have a variant associated with a hereditary condition, your relatives may also have it, but the likelihood depends on the inheritance pattern and your family. For example, if you have it in one of the two copies of a gene that is not on the X chromosome, each of your children has a 50% chance of inheriting it, and your siblings may also have it if you inherited it from one of your parents. For X-linked conditions, the likelihood depends on your sex and that of each child. Whatever the inheritance pattern, if the variant first arose in you (de novo), your parents or siblings are unlikely to have it. Before telling them, confirm the result with a healthcare professional. Your relatives should discuss their own testing with their doctor or a clinical genetics service.