by modern standards it is probably not the healthiest environoment to have chicken poop all over the place. chickens can carry salmonella so diarrhea would not be uncommon for people who share their home with chickens. i keep mine outside but when i did a medical mission in jamaica there were chickens walking around the clinic. at least until lunch and then they suddenly disappeared. in other third-world countries chickens and other animiala often share limited limited space including living quarters. eventually people do get accustomed to the germs and inherent uncleanliness but if you have a choice. children would be best living with other people not chickens. i work in pediatrics so chickens are probably at risk to kid germs too.
isn't it unsanitary to have chickens living inside the home with 5 children?