A Nelson man has admitted stabbing two brothers at a 21st party in Atawhai with a broken bottle.

Kane Lance Dixon, 31, yesterday admitted two charges of wounding with reckless disregard when he appeared in the Nelson District Court.

Dixon was remanded in custody for sentencing on those and other charges on December 21.

According to the summary of facts Dixon was at his address on October 27 where a 21st party was being held for his girlfriend's nephew.

About 7.30pm an argument broke out between Dixon and the 20-year-old victim and his 22-year-old brother.

The incident had calmed down, but Dixon ran back into the carport and was seen smashing a stubbie beer bottle.

Dixon came back with the beer bottle and stabbed the 20-year-old in the lower back from behind. He fell to the ground and partygoers helped him.

He was later operated on at Nelson Hospital for a finger deep wound which was approximately one inch away from his liver.

On seeing his brother being stabbed the other victim approached Dixon, who stabbed him twice in the left side of the body. He required stitches to the wounds.

Dixon declined to talk to police.

- © Fairfax NZ News