Adam Smith was the Father of Eonomics because Adam Smith was the first person who introduced "Economics" as a subject. Adam Smith was a Scottish philosopher and Economist. He was a citizen of scotland and was the professer of Cambridge University. Adam smith is one of the greatest economists throughout history.

[Full name: Adam Smith, Born: 5 June 1723 Kirkcaldy, Scotland, Died: 17 July 1790(1790-07-17) (aged 67)Edinburgh, Scotland, Era: Classical economics
(Modern economics), Region: Western philosophy, School: Classical economics
Main interests: Political Philosophy, Ethics, Economics]

He wrote a book in 1776 and the title was

"The Wealth of Nation"

In his book he discussed the word "Wealth" according to Adam Smith wealth means "Goods and Searvices"
He derived a definition that is

"Economics is the Science of Wealth"

the major points of his definition are:

Production of Wealth

Consumption of Wealth

Exchange of Wealth

Distribution of Wealth

So, Adam Smith is the Father of Modern Economics for his great work towards the society as a Philosopher and also as an Economist.