I am 18 and my sister is 17 can I get temporary guardianship?

I am 18 years old, I live on my own, I have my own job and I have a 17 year old sister who is still a senior in high school. What would I have to do t

I am 18 years old, I live on my own, I have my own job and I have a 17 year old sister who is still a senior in high school. What would I have to do to get the custody of her until she turns 18. My mother already said she will sign what ever she has to.

or:I am 18 years old, I live on my own, I have my own job and I have a 17 year old sister who is still a senior in high school. What would I have to do to get the custody of her until she turns 18. My mother already said she will sign what ever she has to.

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