Tween friendships can be intense. One day your daughter is making a friendship bracelet for her BFF, the next day they aren't speaking. Or your son and his buddy were inseparable until one joined the basketball team and the other the science club. As your tween grows, he or she will use friendships to gauge his or her place in the world. But just know you may have to deal with possible bad influences. So, try to get to know your tween's friends. Invite them over and get to know their families. Just know that who's who in your child's circle can change at a moment's notice.