[_nhynes]

> sibling (n.) (computing theory) A node in a data structure that shares its parent with another node.

https://en.m.wiktionary.org/wiki/sibling

> share (v.) To have or use in common

https://en.m.wiktionary.org/wiki/share

> another (det.) Not the same; different

https://en.m.wiktionary.org/wiki/another

Being one’s own sibling is incompatible with the accepted definitions, so no.