Generate an illustration capturing a heartwarming birthday scene. In it, portray several uniquely patterned cats playing curiously among scattered crossword puzzles. A larger crossword puzzle in the center spells out 'Happy Birthday, Grandson', with each word functioning as the answer to the surrounding clues. Include balloons and confetti in the background to represent the festive ambiance, symbolizing the celebration of a grandson's special day.

Generated with these themes: Crosswords, cats, grandson .

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