Sister can mean the one who was born into your immediate family or the ""sister"" who is your closest friend. Sometimes that friend is even closer to your heart than your family member. In any case, Sisters are the ones that nurture you, support you, laugh and grow with you and protect you at all cost from harm. Other people come and go in your life, but the bond of a sister is never broken. The Tree of Sisters reminds us to cherish all of our sisters and celebrate their importance in our lives.