I am a nanny to 18 month old twins, I have been with them since they wer 12 weeks.
I do all nursery duties, i.e., changing bedding once a week (or when needed) dusting nursery and playroom twice a week, cleaner vacuums cos the boys love the hoover so cannot do it with them around! I wash and iron all their clothes and put them away. (Darn anything that needs it, socks mainly as they have only just started walking.)
I do all their cooking and freeze lots, MBs use it at weekends, which I think is fair as they paid for it and they pay me to work!
I do the family shop, cleaning and tinned goods are done on ocado though.
I also run occasional errands for MBs, dry cleaning, DIY/garden store or take another vehicle out when we go out, if it needs filling with fuel.
My two do sleep for 2 hours in the day though, which is when I get my cooking/ironing done.
These guys are my 3rd set of twins and like Nick said, get them interested in helping, twin 1 has been loading/unloading washing machine and tumble dryer since he was 11 months old, and he puts it into a basket, not on the floor like his youger brother! Now the weather is nice, he hands me items from the basket so I can hang them on the line but gets so mad if I don't say Ta when he hands it to me, every single item!! Love him! Twin 2 just sits and eats while I am busy!!!