Are there any dangers being in contact with someone undergoing chemotherapy?

Are there any dangers being in contact with someone who is recieving chemotherapy? My father-in-law just started recieving chemotherapy for a lung disease called ARDS. My husband and mother-in-law visit him daily. I don't go often because it is a 2 hour drive every day and I have a daughter in school. Should I be concerned about my husband touching and giving his dad a kiss on the cheek or forehead and then kissing me and my daughter?