Can an Adopted Child Inherit From Her Birth Parents?
Adopted children have two sets of parents: their biological
(birth) parents, and their adoptive parents.
Under Washington intestate succession law, adoptive children do not
automatically receive property from their birth parent(s). Instead, the child is considered a child of
the adoptive parents and inherits from them.
Of course this only applies when there is no will. If you gave a child up for adoption and want
to ensure that the child receives part of your estate, you must accomplish this
through a will or other estate planning document.