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Did I pin this already? I love this for an idea to give to my mom to announce that I'm pregnant. :) But maybe saying, "The only thing better than having you for parents, is my children have you for grandparents." That way -- mom and dad can be surprised!
Mother's Day Art project. You could also make flowers with pipe cleaners and tissue paper and cut slits above/below the hand to put the flowers through to make it look like the hand holding flowers! Or fingerprint flowers.