Kids over 10 should be doing their own laundry once they know how to do it your other kids are 5 and 7 right so its okay thst they don't do their own laundry because the 5 year old is a toddler and the 7 year olds only chore should be picking up their toys the 5 year old is going to learn how to clean up after themselves by watching the 7 year old so as long as the 12 year old knows how to do her own laundry the 5 year shouldn't have any chores cause its a 5 year old unless you have them help you clean up their mess NTA the 12 year old needs to grow up and as long as you enforce this with your 7 year old by the time they are 10 and the 5 year old when they are almost a teenager plus its not your responsibility to clean a preteens clothes