A sufficiently expansive state law of survivorship and intestate succession can bar an adopted natural child from asserting a S1983 claim, as there is no absolute right of succession implied by the purposes of the act.
Claims under the ADA and the RA are remedial in nature, not punitive; the statute-borrowing provisions of civil rights law are therefore inapplicable; there is no precedent under federal common law for allowing an adopted natural child to state a claim.
Absent a showing of a true parental relationship, an adopted natural child with a close relationship cannot state a claim under a Fourteenth Amendment liberty interest.
Court properly denied leave to amend, given relevant state statute of limitations, as nature of present claim doesn't hold the door open for relation-back.
Concurrence: Adopted children can establish a 14A claim.
http://cdn.ca9.uscourts.gov/datastore/opinions/2018/07/03/16-17375.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.