my younger brother, or sister (said by an older sister) (see Molina)
Alonso de Molina:
icuh. n. mi hermano, o hermana menor. dize la hermana mayor. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 34r. col. 1. Thanks to Joe Campbell for providing the transcription.