Storgetian

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Storgetian is a term for a headmate or system formed due to a system member's yearning. Similar to amorform, but for familial reasons.

This can be used for system members who form from another headmate's exomemories where they were related. This can be used with -genic, -system, etc.

Related Terms
Nostalject is a term for an introject of someone from a headmate's exomemories, though without a specific familial connotation.