We are a family of 5. I stagger the washing through the week. We have two of these:
http://www.kmart.com.au/product/12-rail-clothes-airer/114080I love them because they don't take up much space. They are very narrow. I can set two of them up along the wall in our laundry and still get to the machine.
I have another rack that is our original one. It is much like the one above, but the top section extends out from the sides, giving an extra two rails on each side. It is quite like this one, but with a few extra rails across the top:
https://www.bunnings.com.au/morgan-20-rail-coated-wire-clothes-airer_p4510093I also have an over-the-door hanger. I don't remember why we bought it. Perhaps back when our kids were in cloth nappies/diapers?? Anyway, it's been broken for a few years now, but I pull it out occasionally to dry sheets. Otherwise, I set up two of the first rail I linked to and drape the sheets between two racks:
https://www.bunnings.com.au/ltw-5-rail-over-door-clothes-airer_p4512253It is rare that I have all racks going at the one time, as I hang outside when I can, but over winter I do sometimes end up with all racks up at once. I don't like to double up, but I do use pegs to hang pants from the back waist at times, rather than draping them in half over the rail. This speeds up drying time and uses less space. I also often hang socks and underpants from the little gaps between each of the rails, using pegs. If pressed, sometimes I will peg socks to the side gaps that go down to the ground, again between the rails. If I get terribly desperate I will lay things over the very top of the rack, with items hanging on the rails below. This helps stop the wet clothes from getting smelly, but I make sure I shift things around as soon as some items below dry.