They also re-interviewed her friend Ashley and her mother Debbie Rose, the last people known to have seen her before she disappeared two weeks ago.
Amy’s older brother, Dean, 17, went to the police station in Fuengirola at 1pm yesterday with his mother, Audrey.
Afterwards, Ms Fitzpatrick said that with each day that passes they are becoming increasingly concerned about Amy.
“We are more and more concerned and Dean is very interested in finding his sister and in helping the police,” she told waiting journalists.
He was helping them build up a picture of their home life and what Amy did, she said.
Dean came to live in the holiday resort between Malaga and Marbella with his mother and Amy more than three years ago. Like his sister he had dropped out of school.
He had already helped police draw up a list of her friends and visit them in the days after her disappearance in the area that is inhabited mostly by British and some Irish ex-pats.
A few hours after Dean’s interview Ms Rose and her 13-year-old daughter went to the police station, the headquarters of the investigation.
Last Thursday they spent several hours talking to police, telling them what they remembered of New Year’s Day, when Amy vanished.
Amy and Ashley babysat Ashley’s three-year-old brother Jake, and at about 10pm Amy left the house to walk home. At some stage during what should have been a 20-minute walk, Amy disappeared.
Police are continuing their on-the-ground investigation and are trawling through the statements they have taken, and whatever they have found on Amy’s computer to discover some clues as to what happened the girl.