Tell your parents your engaged!!

Jalissa
So I'm 19 (20 in December), and I'm engaged but I don't know how tell my family that I'm engaged. My fiancé and I have been trying to tell my mom amd his grandparents for the longest but we get nervous everytime and I will be back at school when my fiancé moves down here to live with his grandparents. How do we tell them we are engaged??