Thank you for your query on Healthcare Magic.
You all three are suffering from an upper respiratory illness due to a virus most probably.
For the cough
of your children you can a give a cough medication containing mucolytic
agents like ambroxol
in prescribed dosage for each individual.
But physical examination by a doctor is important to look at the throat and to auscultate the lungs for any infection.
Therefore I advise you to consult the pediatrician
for examination of your children and for medications.
Hope I have answered your query.