A: One way to keep kittens out of the Christmas tree is to use deterrents like aluminum foil or double-sided tape on the branches. Another option is to place a physical barrier like a playpen or baby gate around the tree. You can also keep the kittens entertained with toys and activities away from the tree to redirect their attention. Additionally, you can train your kittens to avoid the tree by gently nudging them away and redirecting them when they try to climb it.