Winning swim sisters muzzle embarrassing dad Cate and Bronte Campbell place first and second. Photo: Quinn Rooney Cate and Bronte Campbell have made sure that they don't make the same mistake as last year - and that has nothing to do with what they have achieved in the pool. The sisters on Wednesday night booked their berths on the Australian swim team for the world championships in Barcelona, with Cate winning the 100 metre freestyle final and Bronte taking second place. But there is a noticeable absentee in their entourage - their father Eric. The girls, you see, are yet to recover from his memorable press conference during the national titles last year when the sisters made the Olympic team. Flush with the excitement of seeing his daughters go 1-2 in the 50 freestyle after he made a last-minute decision to jet in, Eric release a barrage of one-liners and family anecdotes that, while all in good humour, had Cate and Bronte flushed with embarrassment. The experience seems to have left a lasting mark on Bronte in particular, who, Cate revealed, has made her father sign a contract to never do that to them again. "She actually wrote out a contract that said something along the lines of 'to the best of my ability I will not embarrass my daughters on national television'," Cate said. She left a small margin of error because she said 'to the best of his ability', so she's decided not to be too harsh on him. But she's got that signed and it sits in her sock drawer, so he's sworn off any interviews for the time being. The sisters have received their congratulations in other ways this year. My little sister dobbed mum in. She called up Bronte and said 'mum's been crying'," Cate said. We got an email from our grandfather who said 'good work girls, you just need to tie for first in the 50'. He's never satisfied. The sisters have continued their strong form and gave an indication that they could fulfil their grandfather's wish, with Cate the fastest qualifier for Thursday night's 50 freestyle semi-finals in 24.78 seconds, while Bronte was second-quickest in 24.95. Cate said she was feeling "nice and relaxed," even though the two world-class sub-53-second times had taken a bit out of her. It's tough on the body. I didn't expect last night to hurt so much, but I think that's what happens when you take your body to the next level," Cate said. It needs some time to recover and I guess I didn't realise how hard I really pushed it in the semi-finals. To go two sub-53 swims in two days is amazing and I can't wait to see what another 12 weeks of training can do. I'm feeling really good, really confident. We'll just have to see how much swimming those fast 100 times have taken out of me, but this is a good learning curve, learning how to recover properly and taking care of your body in that way. Meanwhile, the 1500 freestyle final is looking to be a battle of the next generation with Jordan Harrison, who has already qualified in the 400 freestyle, the fastest qualifier for Friday night's final in 15 minutes, 29.52 seconds, followed by Mack Horton (15.30.16), Jarrod Poort (15:30.24) and Matthew Levings (15.34.69). Jennie Johansson is the fastest qualifier for Thursday night's 50 breaststroke semi-finals in 30.82, ahead of Leiston Pickett (31.37) and Lorna Tonks (31.78). Daniel Arnamnart was the fastest qualifier for the 50 backstroke semi-finals in 25.45 seconds, with Benjamin Treffers touching in 25.56 and Bobby Hurley in 25.64. Kayla Clarke (S14) and Rick Pendleton (S10) are the top qualifiers for the women's and men's 200 individual medley multi-class final.