Yes, this is possible if the child hasn't been adopted. or the mother could destroy everything the child has known and regain custody after they are adopted. This would be a very wrong act and it is not recommended.
No! Once a child is adopted they are legally the child of the adoptive parents. The only way that child could be a step-child is if the adoptive parents divorce and the custodial parent re-marries. Then the child becomes a step-child to the new parent.
Yes, an older child can be adopted.
No, unless the child is adopted in some sort of fraudulent manner. Even then you have no claim on that child.
You could be asked to pay for any expenses the mother had after birth but before the adoption. Once adopted the adoptive parents pay for their child.
Slaves could be adopted by the families to which they were sold or they could marry into their masters family.
The adopted child have the same right as the biological child.
you could apply to the hospital where the child was born for the birth records, then go on from there
Any types of adoptions or parental rights sign offs have to be done in front of the courts. The adopted child could be signed over to another adult as long as that adult is found to be fit enough to be capable of the upbringing of the said adopted child.
There are a number of ways in which artistic ability could be seen in a child. You could let the child play with music for example.
I don't think that any doctor can ask anything about an adopted child that they wouldn't to a non adopted child.
If you are asking if Selena was an adopted child: No If you are asking if Selena has an adopted sibling: No Selena is an only child