I don't know, really. Looking at blood relatives, I certainly love my grandma and sister. My mom died twelve years ago, but I did love her, too. Aunts, uncles, cousins...I like them, but they're more acquaintances than anything else. My dad's not my biological dad, so he isn't technically speaking a relative, but I do love him. My stepdad as well.
Having said all this, though...in general, my friends are far more important to me than my family, so while I do love my family in a way, I love my friends more.