The McMahon siblings, Eve and Ewan, both made strong starts to their ILCA European Championships prospects in Sweden on Monday, though it wasn't plain sailing for either at the start of the six-day regatta.
Eve was one of nine boats penalised for early starting in the tricky current and strong winds and received maximum points for the disqualification.
However, the Howth sailor bounced back in race two by leading her division most of the way before the wind died and she took second place for that race.
Older brother Ewan had a better day and is third European out of 153 boats thanks to a second and a sixth.
Carlow's Finn Lynch also opened well with a third and an 11th and needs to maintain this form to secure a strong overall Gold fleet place ahead of the final series that starts on Thursday.
All three Irish sailors are now counted in the top 10 in the world as they begin to focus on the 2028 LA Games.
The Irish sailing squad has just returned from a three-week training camp at the Los Angeles Olympic venue.
