Let's say somebody in your house gets real sick. Diarrhea, fever. This is your spouse or child so you are most likely NOT going to put them out in some quarantine tent (or maybe you would?)
How would you care for this person?
I'd say give them a quarantine "room" or wing of the house.
Wear a mask and latex gloves when caring for them....if the illness seems unusually dangerous you may want to wear an "overgown" when you go in the room to bring them food etc. that you can strip off before you go around the house, sitting on other furniture etc.
If this person is having a lot of vomiting or diarrhea issues they may need to be camped out in the bathroom with an air mattress or sleeping bag (also, bathrooms have more hard surfaces that are easier to disinfect).
Try to designate ONE person to care for them so that everybody doesn't get sick at the same time.
Frequently wipe down hard surfaces in the house with a diluted bleach solution (door knobs, countertops, faucets).
everybody in the house use hand sanitizer frequently (like maybe 10+ times per day).
those are just some thoughts off the top of my head....I don't actually know if they are valid quarantine procedures or not....just seem logical to me.