Who is responsible for the development of social skills in a child? (1) School (2) Parents (3) Both

To the best of my knowledge first should be on parents and secondly should be on school.

While school can be a positive social experience for many children, for others it can be a nightmare.

School is not only a place where children learn reading, writing and math. It is also a place where they learn to get along with other people and develop social skills. Social skills are the skills we need to interact adaptively in our cultural environment. Although students don’t get grades on social tests from their teachers, their peers are constantly giving them “grades” on “social tests” every day. If a child does well on these “tests”, he is apt to be well liked and happy. He will enjoy school and look forward to coming to school. If a child fails these tests, she is apt to feel disconnected and left out.

School is the first home so it's only the school that does

3. Both the teachers and the parents.

Both are responsible for the development of social skill of a child. A school can help develop the skill in the child but it is the parents responsibility to maintain it at home. Infact the development of any child goes hand in with the parent and the teacher. 

Both are responsible for that, mutul coordination and cooperation produce fruitful results and solution for problems related to child development.