No, it is not physically possible for a person to give birth to their own brother or sister. The reason is that siblings are typically born from the same set of parents, and one person cannot be both the parent and the sibling of another individual.
When a child is born, they are the offspring of their biological parents. If a person gives birth to a child, they become the child's parent, not their sibling. Siblings are individuals who share at least one biological parent, but they are not capable of giving birth to each other.
The concept of giving birth to one's sibling might be a topic of science fiction or hypothetical scenarios, but it doesn't align with the biological reality of human reproduction.