Answer:
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
I am mother and father, but never give birth or nurse. I'm rarely still, but I never wander. What am I?
I may only be given but never bought. Sinners seek me but saints do not. (one word).
My voice is tender, my waist is slender and I'm often invited to play. Yet wherever I go, I must take my bow or else I have nothing to say. What am I?
I'm not a bird but I can fly through the sky. I'm not a river but I'm full of water.
Both old people and owls are said to be possessing this trait