I can not create a logo for you, but i can give you a few suggestions. Your aim is "sending comfort to terminally ill children". Think about a short name which describes that best, for example "Sending Comfort". And try to create a symbol which symbolizes the most matching attributes (for example: comfort, hope, help, support, care). Dont choose too many attributes to get symbolized. Only the most matching ones. Stay simple but close to what you are doing whith your design.
Good Luck!!

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