Birth or older
In Mississippi, you are not a legal adult until 21 years of age. However, the laws are weird. Children can be released from custody at 18. They are considered an independent minor if they are able to support themselves.
If this relates to custody, age 18. see links
There is no minimum age.
Age six
ANSWER: Yes. Regardless of your age, you are still the mother. You will have legal custody unless those rights are terminated by the Court.
The ones asking for custody and their lawyers. The child can be there too depending on their age. At a certain age the judge would like to hear what they want.
YES
depending on your sisters age you would probably have to contact a child youth socail worker (cys) and go through a court process for custody.
The child should probably exist. That is, older than -9 months. I don't think there's a minimum age. If the parent believes it is in the child's best interest to be in the parent's custody, they should file for custody. Period.
Age 18see links
yes
see related question