Thank you for your query.
It appears that most of the family members are down with some infection which appears to be viral in origin. Though you are disinfecting the house but the infection is not going to get controlled that way.
As your kid is running fever
blood I suggest you consult a doctor immediately. Though paracetamol/acetaminphen can be given to reduce temperature but they may aggravate bleeding.
I hope I have answered your query to your satisfaction.
Wishing your kid an early recovery.