Did Glenn Miller's children ever know their biological parents?

Glenn Miller's children, which include his daughter, Anne, and son, Jon, were born to Glenn and his wife, Helen Miller. They knew their biological parents, as they were raised by them. However, Glenn Miller disappeared during World War II in 1944, which left his children without their father for much of their lives. Despite this tragedy, they grew up with the legacy of their father's music and contributions to jazz.