4. In stringed instruments the Violin is called the "baby", the Viola is called the "big sister" of the Violin and the Cello is called the "big brother" of the Violin. The Double Bass is called the "big brother" of the Cello or the "grandfather" of the Violin. Rather dubious family hierarchy! Not clear where "Favourite" comes in, but given the letter count the answer could be CELLO.
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