All depends. I've had girlfriends I introduced early on and others I didn't introduce till 4 months in. I don't want my family getting attached to a girl when I'm not even fully sure how much I like her yet. If I'm saying "i love you" it's pretty solid
This could go down in so many ways. Are you sure you want to introduce him/her to your parents? Or do you want to meet his/her parents? I am no expert, but aren't couples supposed to avoid their actual/potential in-laws?
To answer your question, I would say it depends on factors like the parents themselves (how strict/accepting they are), how close the couple is, what the future plans are, how much you actually want in-laws (or spouse's parents) in your life, etc.
Depends on your parents. I would be comfortable introducing any girl to my parents because they are pretty chill. But I've seen people keep relationships a secret from their parents because they are afraid 😨 of their parents reaction. Also I think it would depend on your gf/bf and if they meet your parents expectations.