Can a minor (3 years old) enter the establishment with a parent?

Yes

Absolutely

Yes, I took my 10 year old daughter there.

Sure. Families dine there often. There's seating indoors and outdoors.

Yes. There's also outdoor seating

I think a young one can go anywhere as long as they are polite and are not screaming their heads off and are basically well behaved... And I find most children in restaurants nowadays are rather well behaved