Michael Rixon blasted his second half century of the season to leapfrog his elder brother and take the No 1 spot on the batting standings, as North Tamworth beat South Tamworth in a Twenty20 at Riverside 2.
Michael Rixon struck a 45-ball 58 not out as the Redbacks passed Souths' 8-131 in the 19th with four wickets down.
The No 3, who posted a competition season-high 120 in a one-dayer against West Tamworth in round three, has scored 289 runs in five innings at an average of 72.
His opener brother scored 18 on Saturday, to take his season tally to 280 runs at an average of 93.
Family bragging rights are on the line.
It was second-placed Norths' fourth win of the season, while fourth-placed Souths suffered their third loss. Veteran Norths quick Adam Greentree took 3-21 off four overs.
At No 1 Oval, ladder leaders City United won for the sixth time this season with a 62-run defeat of Bective-East.
It was City's second-straight win after they suffered their sole loss of the season when Old Boys beat them in this month's one-day final.
Put into bat, City made 7-131. Richard O'Halloran (32) and Oscar Spinks (27) top-scored for City, while Liam Rodgers and Calum Henry made 24 and 23.
Jye Paterson (2-24 off four overs) was Bective East's best bowler, with his 14 runs a joint top score as the Bulls were dismissed for 69 in the final over. Tait Jordan and Andrew Baines both took three wickets.