Some questions come up while reading, don't need an answer but consider:
Is she working full time?
Where is the father of the child?
How old is the child?
Is your sister older/younger than you?
Why didn't she move in with your parents instead?
Sit her down during an otherwise non-stressful time and say
"This arrangement isn't working. Here are my standards with respect to cooking, cleaning, noise, my guests, etc. If you can't do this I will move your things to the curb and change the locks. If you comply, you can stay an additional 60 days."
Or start smaller and tackle the issues individually. "We don't leave dirty dishes in the sink in my home. I'm asking you from here on out to do (your dish standards). Can you agree to do this?" repeat as necessary for other issues. When she perhaps inevitably cannot comply, say "This isn't working out since you won't comply with my standards. So you have 60 days to move out."
Is she working full time?
Where is the father of the child?
How old is the child?
Is your sister older/younger than you?
Why didn't she move in with your parents instead?
Sit her down during an otherwise non-stressful time and say
"This arrangement isn't working. Here are my standards with respect to cooking, cleaning, noise, my guests, etc. If you can't do this I will move your things to the curb and change the locks. If you comply, you can stay an additional 60 days."
Or start smaller and tackle the issues individually. "We don't leave dirty dishes in the sink in my home. I'm asking you from here on out to do (your dish standards). Can you agree to do this?" repeat as necessary for other issues. When she perhaps inevitably cannot comply, say "This isn't working out since you won't comply with my standards. So you have 60 days to move out."