Can a parent choose not to get they child vaccinated?

Yes, but. . . This is a free country, so unless there is a major epidemic, people may choose to not get vaccines. However, all children are expected to be vaccinated because they can be harmed or killed by diseases, their diseases can infect other people living next door, the diseases are easily preventable, and since america is an equitable society, all children must share in the minuscule risks of vaccines.
Yes. However, more and more pediatricians are refusing to have unvaccinated families in their practice because of the risk they pose to other patients - especially in the waiting rooms of their clinics. If an unvaccinated child comes into clinic with whooping cough or early meningitis, that child puts others needlessly at risk - especially newborns and kids with immunodeficiency (undergoing chemo).