Green’s Dictionary of Slang

T-Jones n.

(US prison) the mother of a prisoner.

1971–2		C. Shafer ‘Catheads [...] and Cho-Cho Sticks’ in Abernethy Bounty of Texas (1990) 216: Tee- Jones, n. – a Black expression for mother.
2000		Other Side of the Wall: Prisoner’s Dict. July 🌐 T-Jones: an inmate’s mother; Parents. Used primarily by African-Americans. ‘I got a letter from my T-Jones.’.

In phrases

get T-jones on (v.)

to act authoritatively.

2005

Prison Slang Mommyblogger mydogharriet.blogspot.com 23 Sept. 🌐 Mommy, I suggest that you get T-jones on the child and say to her Press you bunk punk!