Yes, your 20 year old daughter can be left in charge but she also has be registered at the front desk in order for her to get an extra key for the room. If she leaves the kids unattended there are consequences, but it's mostly your responsibility.
Mario is correct
She is an adult, so yes. Just as the others have said, make sure you get her registered and just keep an eye on the kiddos
Yes, since your other two are 14 and 17, she will just have to be in the house and they can roam in the house They may also like being in the hospital from time to time
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