English

interparental

From inter- + parental.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *perh₃- ‘to produce, beget’

…

Proto-Italic *par-(e)nt-

Latin parens ‘parent’

Latin parentālis

Middle French parental

Today it means

adj Between parents.

Language periods are conventional ranges, not dates for this word.

Etymograph / interparental