Usually I don't. I base my characters off of feelings. Like, for example, just out of the word happiness. I could describe a energetic, little girl. With blonde pig-tails and bangs. She has a high temper but can make anyone feel happy. She constantly has a smile on her face and laughs at everything.
I also get inspired by different animals I see. Like the little girl I described, I could've based her off a monkey. :P
Anything really! Hope that helps. :)
No. I usually get my inspiration for my characters from my surroundings and my emotions. My family just doesn't strick me as good story character types.