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).
Thus your motherâs [first] cousinâs great-grandson is your second cousin twice removedâand of course you are also his second cousin twice removed. Example 2: A friend asked me to help him figure out what relationship he was to his motherâs auntâs great-grandson.