EXCLUSIVE

Late wrestling LEGEND Dusty Rhodes' daughter-in-law, Brandi Rhodes, is gettin' involved in the family biz ... inking a deal to wrestle with TNA Impact Wrestling, sources tell TMZ Sports.

Brandi -- who's married to former WWE superstar Cody Rhodes -- has signed a deal to wrestle for TNA's Knockout Division a.k.a. super hot chicks who fight.

FYI -- Brandi was formerly a ring announcer (not a wrestler) for WWE ... before parting ways with the company earlier this year.

No word yet when Brandi will make her Impact debut.