A growing youth has a wolf in his belly. To be the black sheep of the family. Blood is thicker than water. A chip off the old block. You can lead a horse to water, but you can't make it drink.
Death is the great leveller.
To pull the wool over someone's eyes. To keep something under one's hat. To cast pearls before swine. It's better to wear out than to rust out. A stitch in time saves nine.