Sorry, I must be one of the few people here who never watched the Brady Bunch.
Perhaps in part because from '69 until '74 I watched little if any TV. I was too busy with other interesting things to do with my time in college. When I finally got a set around '74, sitcoms were not my thing.
Thanks to the internet however I'm aware of the "Marsha Marsha Marsha" meme and the housekeeper Alice. But I didn't know anybody in the '60's who had a housekeeper, aside from one high school classmate who lived in a relatively wealthy enclave of SF (Seacliff).