K.F.
When the kids are sick is just about the only time we use that antibacterial gel. Teach the 3 year old to use it whenever he coughs, sneezes or blows nose use the gel. You should use the gel every time you help little one blow the nose.
Open the windows and let fresh air in. The germs are mostly airborne and can get trapped in the house. Opening the windows infuses fresh air into the home which is helpful.
Bulk up on the vitamin C. Give little one plenty of C and water to flush the system. It is critical to getting well.
Don't eat or drink after the 3 year old. Feel better soon.