The 22-year-old singer was gunned down by a deranged fan following a concert performance in Orlando last month and her parents Tina and Bud and brother Marcus have paid tribute to her "joyful heart and beautiful voice", reported Us Weekly.
In a joint statement on a GoFundMe page, they said: "The outpouring of love and generosity that has been displayed to our family throughout these last few weeks has far exceeded anything we could have ever imagined.
"As we have always known, Christina's life was so very special, not only to us, but to everyone she touched with her joyful heart, beautiful voice and love for life and the Lord."
"Words cannot express what the many memorials, donations and tributes shared by Christina's fans and those in the media and entertainment industry mean to us.
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"She will live on in our hearts forever. We will take our time in determining the best ways to honor Christina moving forward. Thank you."
The GoFundMe page was launched by LH7 Management - which is operated by Christina's manager, Selena Gomez's stepfather Brian Teefey - to help the singer's family during their "time of need".