Hiv testing during pregnancy

My sister in law just found out her first childs father passed away from complications due to aids a week ago. No one knew he had aids but his brother up until he died. Her child with him just turned one. She is also currently pregnant with my brothers child.

I told my brother they both need to get tested but he said that they don't need to because the previous baby was not born with HIV and that women get a HIV test during prenatal care n child birth. They also said that a doctor will not let anyone give birth to a baby with HIV (which I know is not true) And my brother says that since donates plasma he does not need to be tested either.

I thought that women are not always tested for HIV during prenatal care or birth and that just because u have it does not mean it will be passed to ur baby.

Are you tested for HIV during prenatal exams and again when u have your baby? Should they still get an HIV test? How long does it take for HIV to progress Into aids. They are telling me that he got HIV less than a year ago?