Joanna Fortune: My daughters are constantly arguing with each other

Sibling arguments... "It doesn't take much to set them off. It breaks my heart to see them behave this way. The last time they fought, they refused to talk to each other for a week. I know it's probably related to their hormone changes, but the tension is wearing me down."
Siblings are our first experience of both a friend and an enemy — but hold in mind that the sibling relationship is typically the longest relationship we will have throughout our lives.