I have 5 paid personal days for sickness, appointments, etc. per year. I won't use them unless I have to, so it's not like I am going to just take them anyway if I am not sick, but none of my parents complained and I am a new provider. Making them pay when their kids are sick is different because I am still working and they are paying for the space. I think it is fair to ask for paid sick days as long as it is clearly in the contract from the start.