Buddhist path X Romantic Relationships and Sons
You are mixing up the monk's life with lay life. Lay people are only expected to follow the five precepts on regular days and the eight precepts on Poya days. So they can still get married and have children. You can still attain enlightenment while being a lay person. Visaka was a Sothapanna. But she married and had many children. A monk's life is more congenial to the practice. But the choice is up to you. Buddha never said that all should become monks. Not everyone has the mental fortitude to leave the lay life.