What Are The Precautions To Be Taken Post Chemo For Colon Cancer Stage 4?

I wanted to know about me taken care of my sister who just started chemo today for colon cancer stage 4 is there is precautions I need to be aware of? and I have a 1 1/2 year old grand child and I needed to know if i will be putting him in danger by being around my sister. I baby sit my grandson 2 days a week. Please help ease my mind