The Jedi have rules against marriage and having children, the excuse is to limit personal attachments.

But the real reason is to keep Force Sensitive users from multiplying. Vader's Force sensitivity passing to his children shows it's hereditary.

Force Users can be incredibly powerful, and increasing in number, they could become a threat to the stability of the Republic, as many can rise to become warlords or corrupt politicians due to their pre-cognition and mind control abilities alone.

So the Jedi Order was created to search the Galaxy for Force sensitive children, round them up and indoctrinate them into a monastic life. Their purpose becomes to serve the will of the Republic as living weapons, diplomats and generals.

From Redditor u/dontwasteink