Matthew Selby, 19, appeared at Mold Crown Court charged with the murder of sister Amanda at the park in North Wales.
Selby, of Ashton-under-Lyne, Greater Manchester, appeared by videolink from HMP Berwyn.
The hearing lasted about 15 minutes, and he spoke only to confirm his name. Wearing a sweatshirt, he leant on a table as he addressed the court.
Selby was arrested after officers were called to a report of a “domestic disturbance” at Ty Mawr Holiday Park in Towyn, near Abergele.
An area of the caravan park, which was busy with holidaymakers, was sealed off on Saturday afternoon.
An air ambulance was sent to the scene and forensic detectives moved as part of the investigation.
Judge Rhys Rowlands set a provisional trial date for February 28. The case is expected to last five to seven days.
Selby, of Windermere Crescent, is due to appear for a plea and trial preparation hearing on October 29.
An order made under Section 45 of the Youth Justice and Criminal Evidence Act 1999 to ban the naming of the victim was lifted by the judge.
Ty Mawr holiday park is part of the Parkdean Resorts brand and is a popular destination for people taking a break in North Wales, particularly from the Midlands and North West England.
A spokesman for the park said at the time of the death that staff were “shocked and saddened”.
Amanda’s school, Droylsden Academy, has paid tribute to her.
A message on its website said: “Our school is saddened to have received the tragic news that one of our students, Amanda Selby in Year 10, has lost her life whilst on holiday with her family in Wales.
“Our deepest sympathies and thoughts are with Amanda’s family at what is an incredibly difficult time.
“Our school family is devastated by this awful news. Amanda was a lovely student and she will be sorely missed by students and staff.
“Clearly, many members of our school community will be affected by this loss and we will be offering support to those who need it in the weeks and months ahead.
“We will also plan a tribute when the time is right so that we can remember all that Amanda brought to our school.”