no.
YES! If the adult sibling doesn't, the person can be seen as heartless by others, and they should be mentally evaluated -- they may have a mental disorder.
yes,you can legally adopt the minor.You will need to see a lawyer for free advice consultation.There may be a few requirements depending on what state you live in,but most are about the same when it comes to that.
With parental consent yes, and it also matter how old they both are.
If the parents have legally given up the child, the death of both parents, both parents are in prison, both parents have psychiatric problems and aren't able to raise a child, and much more reasons; the older sibling can become the legal guardian, but of course you must be 18 years or older, have the correct income for you and guarding sibling to maintain school, food, shelter, etc. and you must be seen by judge in court to approve of the guardianship.
Yes, if the parents have legally given up the child, the older sibling can become the legal guardian, but of course you must be 18 or older and you must be seen by judge in court to approve. I have seen this with the death of the parents, and i am pretty positive you can, talk to a lawyer.
Yes, single parents can adopt as well. Both men and women.
If you both share the same set of parents it's your full sibling. No matter how many children they have together, they are all your full siblings. If you share one parent it's your half sibling.
No. definition: Each of two or more children or offspring having one or both parents in common.
That is going to depend on your state.
Biological siblings have at least one biological parent in common. See related question.
Both biological parents have to sign their rights away or there will be no adoption.
Yes. if the custodial parent can not take care of the minor the non-custodial have first dibs.