We have a big pizza/Italian place that does that. Big main dining room for all ages, then a smaller one centered on the bar that’s no kids. They also have separate outside seating areas for nice weather. Works well.
Knew a family restaurant, also Italian, that did that in NYC. Added on behind the kitchen with its own entrance. Maybe a dozen tables-for-two, a small service bar, waitress always at the ready, low lighting and a jukebox with NO loud, raucous music. They called it “The Intimate Room”
One time I took my girl there for her birthday before going out on the town. She couldn’t believe it when the waitress brought out a birthday cake with candles. (I had dropped them at the kitchen on my way home from work) The other couples there sang “Happy Birthday” without any prompting and were rewarded, as well as the waitress and cook, with some cake.
Hard to believe that was 45 years ago....different world.
Thanx for the trip down “Memory Lane”