Yes but the other parent needs to be ok with it and so does the 19 year old because he/she is an adult.
A 19 year old is an adult. It is up to him/her if they want to be adopted.
No, at age 19, the "child" is an adult responsible for his own actions. The parent has no legal authority to make the 19 year old do what the parent wishes, therefore the parent cannot be held liable for the child's actions.
When I married at 17 to a 19 year old, a parent ot guardian signature was required.
At 19 you are a legal adult. So yes, you can get married without consent.
If they have parental consent, they can get married.
Yes, as long as its the parent thats filing, the child wouldn't be old enough
No, a 17 year old can not move out with a 19 year old in Illinois without parent approval. If the 17 year old has approval, they can move out.
With parent/legal guardians consent sure i don't see why not.
If the 17yo is a runaway, yes. It's illegal to help a runaway from home.
Yes, adults can be adopted. You will need to consult a lawyer but it is fairly common. HOWEVER, the 19-year-old is an adult so they cannot be adopted "single sided," that is, without their consent. (Note that a non-US-citizen 19-year-old cannot come into the US and become a citizen through adoption the way a younger child could.)
Only if there's intercourse.
One should be through with high school before becoming a natural parent.