By 18 they are emancipated so unless there are reasons like mental illness where they can not care for themselves or something where you have to go to court to get guardianship, you can not get custody.
Contempt of court as regards custody is considered a change of circumstance resulting in a change of custody.
With regard to child custody, the court must consider what is in the best interest of the child. A felony might hurt a parent's character, but it isn't necessarily a bar to having custody. It just depends on the specifics.
Yes
Yes, but she's still required to honor the custody agreement.
The child still needs food, shelter, etc.
In every state except Arizona the mother has sole custody of the child and the father has no assumed rights until granted them by the courts.
And you are? If the parents were not married the mother has custody until the father can petition for it after he has proved paternity in court. If married you have equal custody. Just living with you does not give you custody. it has to go through court.
They have the same rights regarding their child as adults parents have. At 18 they are adults. If they are below 18 they are still in charge regarding their child but their parents are in charge of them because they are not emancipated until they are 18.
No, unless there is a specific provision written into the child support orders addressing secondary schools.
The law that applies is the law of the governing state of Maryland even if child lives in another state. If Maryland law permits support for post secondary education, then it would be granted. Even if you change the venue to PA and record the child support order in PA, the law must still be enforced based on the original governing state. However, I would certainly not move your child support order to PA since PA law does not allow for any post secondary support unless it is in the orginial child support order or some other written agreement.
see links
There are many variables, depending on the state, the age of the child, custody arrangement, and any rebuttable presumptions. It would be evenin a few percentage points of 18% of gross.