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).
COUSINS: The children of siblings are first cousins. Thus your children are first cousins to both your nieces nephews and your spouseâs nieces/nephews. But your nieces nephews and those of your spouse are not related to each other because their parents are not related. First cousins are also called full cousins or cousins-german.