From: Chewa, Southern Africa
Source: Chewa/Chichewa (Malawi) oral-tradition proverb (mwana wa nzako ndi wako yemwe ukachenjera manja umadya naye). Earlier recorded here as documented in zambianobserver.com's Chewa proverbs page; that page, fetched directly (all 30 entries checked), does not contain it. The proverb is independently attested elsewhere with the same wording.
The meaning given here is our own reading. Other interpretations exist.