-pil.

-PIL a necessarily possessed form, one's offspring, son or daughter / hijo, hija (S) To mean the offspring of someone, this is used in possessed form, and the plural is necessarily suffixed with plural possessive -HUĀN. Unlike PIL-LI 'noble person,’ this plural does not reduplicate, NOPILHUĀN 'my children' contrasts with NOPĪPILHUĀN ~ NOPĪPILLŌHUĀN 'my lords,' the latter forms rather unlikely without the honorific -TZIN. Honorific -TZIN is generally but not universally used with 'offspring' too, nopiltzin 'my child' (Cf.55v). Although PIL with the sense of child rarely occurs in absolutive form, the diminutives PILTŌN-TLI and PILTZIN-TLI do, and in these the plural stem does reduplicate in just the same form as PIL-LI 'noble person,’ PĪPILTZITZINTIN. See PIL-LI.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 194.