If your children are in a center, it is very common to keep one child home and bring the other to daycare. It happens ALL the time and we don't give it a second thought. We do keep a closer eye on the sib who is with us if the other is home sick. We call parents immediately if the child shows ANY signs of illness. I personally get hyper vigilant around the siblings of a sick child. ( Washing hands more often, not letting them in others face , etc)

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