Thank you for your query on Healthcare Magic.
Your daughter is suffering from a viral illness which presented as cough, conjuctivitis.
For fever you can give paracetamol
in prescribed dosage.
Clean her eyes with a soft, clean and wet cloth with using sterile water.
For your son hives, you can apply a calamine containing lotion externally over skin for soothing effect.
If there is itching, you can give an oral antihistamine like cetirizine
in prescribed dose.
And I advise you to consult the Pediatrician
for the examination of your children and for the prescription of specific medication.
Hope I have answered your query.