Fever can support the immune system's attempt to gain advantage over infectious agents, such as viruses and bacteria, and it makes the body less favorable as a host for replicating viruses and bacteria, which are temperature sensitive. Infectious agents are not the only causes of fever, however.
Your sister's grandson is your great nephew. You are his great aunt (if you are a woman) or his great uncle (if you are a man).
The great grand niece has a great grand aunt, or great grand uncle, who is the sibling of one â¦ of her great grandparents. In normal conversation, such a person would usually be called Aunt, becasue adding all those greats and grands is cumbersome and would probably just make her feel old.