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).
Enter relative: Relatedness coefficient: what percentage of your genes you share. Degree of relation: how far you are from that person in your family tree. So, your father's half-brother's granddaughter is 3.125% related to you and 5 steps removed from you in your family tree. Did you know... The curious case of double cousins occurs when two siblings from one family each marry two siblings from another family.