The first child born to parents

A person being the first in their family to achieve something

किसी परिवार में पहली बार कुछ करने वाला व्यक्ति

English Usage: He was the firstborn in his family to graduate from college.

Hindi Usage: वह अपने परिवार का पहला था जिसने कॉलेज से स्नातक किया।