Amarjeet Singh-Bhakar, 37, died after a disturbance on Prince Edward Avenue, Rhyl, at about 03:00 BST.
The 15 and 16-year-old, who cannot be named for legal reasons, were remanded in custody until a hearing at Mold Crown Court on Thursday.
Wrexham Magistrates' Court heard one of the youths was also charged with wounding another man.
Four other men - Mr Singh's cousin, Amar Singh, 28, and younger brother, Mohanjeet Singh, 18, Ameer Hamza Wahid, 24, and Sanah Ullah, 30, all from Greater Manchester - have been remanded in custody until 2 June, charged with violent disorder.
A 15-year-old youth, also from Greater Manchester, was charged with violent disorder and remanded in youth detention until 2 June.
In a statement released by North Wales Police, Mr Singh-Bhakar's wife, Sushi, said her shopkeeper husband had been a "real family man".
"He was so caring and everything he did was for his family and his two children," she said.
"He was my soul mate and everyone loved him to bits. We will miss his smile and the way he lit up a room when he walked in."

The Beast Race featured 20 obstacles - many of them involving cold water and mud.
Entrants could complete the event near Inverness solo or as part of a team.

After starting eighth on the grid, Rea led by lap three following a stunning couple of opening circuits as he moved ahead of Kawasaki team-mate Tom Sykes.
Northern Irishman Rea was 2.88 seconds clear of England's Sykes at the finish with Welshman Chaz Davies in third.
The success was defending champion Rea's ninth win of the season.
Despite being eighth and seventh on the grid, Kawasaki rider Rea and Sykes were able to produce pace which none of the other competitors could live with.
Rea's ride maintained his sequence of podium finishes at the American venue going back to 2014 as he extended his championship lead over Sykes.
The championship now takes a five-week break until the next round in Germany and Rea said he was "going to enjoy the flight home now".
"What a way to go into the summer break and what a day for Kawasaki. A one-two again," added Rea, 30.
Davies, who finished 4.847 seconds behind Rea in Sunday's race, is 115 points adrift of Rea - champion for each of the last two years - with Marco Melandri a further 37 points back.
The winner's fellow Northern Irishman Eugene Laverty earned a creditable sixth place on his Milwaukee Aprilia after crashing out of Saturday's race one, while England's Alex Lowes finished in ninth spot.
Ducati rider Davies won race one on Saturday in front of Rea and Sykes.
Two youths have appeared in court charged with murder following a stabbing in Denbighshire on Sunday.
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A 10km obstacle race was held at Aldourie at Loch Ness at the weekend.
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Jonathan Rea extended his lead at the top of the World Superbike standings to 59 points after dominating race two at Laguna Seca in California.