Havant siblings Chloe White and Callum White pocketed trophies in the fourth leg of the Cuestars South of England Under-21 Tour in Coulsdon.
Swindon teenager Shane Kearns increased his lead in the race for the Bronze Tour title with a 2-0 win over Chloe in the final at the Frames Sports Bar in Coulsdon, south London.
Meanwhile, Callum also had to settle for second best as he went down to Bournemouth potter Bradley Cowdroy in the plate final.
It could have been even better for Chloe, who breezed through the group stages, topping pool A with a superb break of 34 along the way.
Kearns, who she defeated 2-1 during the early skirmishes, was almost knocked out.
In the end, though, he scraped through to the semi-finals by a single frame behind Chloe.
Will Forster, from Gosport, was the player to suffer.
The Mayfair talent was edged into third place and had to settle for spot in the plate competition, where he was beaten in the preliminaries.
Callum finished third in pool B, as Swindon’s Riley Ellis and Salisbury’s Arnie Petty eased through to the last four.
Chloe then beat Petty 2-0 before losing to Kearns, who sealed his final spot with a 2-0 defeat of Ellis.
In the plate competition, Fareham’s James Budd reached the quarter-finals before going down to Bournemouth’s Reece King.
Callum, however, was in fine form as he beat Salisbury’s Keegan Reed and King on his way to runner-up spot.
Kearns won the first leg of the championship in Woking before finishing second to Callum at Salisbury.
He now leads Chloe by 16 points in the overall rankings, with Callum sitting fourth.
The fifth leg of 10 is in Bournemouth on January 8.