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).
Your motherâs motherâs sister is your motherâs aunt and your great aunt. That womanâs daughter is your motherâs first cousin. Since you are your motherâs child, you and her first cousin are first cousins once removed.