Jack has four sisters aged 11, 17, 18 and 20.
A fundraising site had been set up to help Jack's family. The Givealittle site has raised $40,000.
The family, who have expressed a desire to donate funds to the people who have helped search for Jack, released a statement yesterday sharing their gratitude to searchers.
"During what has been an extremely tough week for our family, we would once again like to say thank you to every single person who has reached out to us with your caring comments, gestures, thoughts, offers of support and donations.
"The selflessness and generosity of so many has enabled us to draw strength from you all in this difficult time.
"Thank you from the bottom of our hearts and please know that we will be eternally grateful."