"Biological children" refers to the children who are genetically related to their parents, meaning they share certain physical traits and characteristics with their mom and dad. Full definition
We always knew that we wanted to adopt but also knew that financially with 2 biological children of our own that the cost was too much. (theletteredcottage.net)
Of course, as with biological children, there are no guarantees this will happen. (americaadopts.com)
Would you consider risking the safety of your own biological children by adopting a violent teenager? (religion.blogs.cnn.com)