What is the difference between maternal and paternal?
Paternal is related to the father while maternal is related to the mother.
Example: Your maternal parent is your mother and your paternal parent is your father.
Maternal relatives are those people who are related to you through your mother's family. They include your mother's grandparents, parents and siblings, and the sibling's children (your cousins). Paternal relatives are those people who are related to you through your father's family. They include your father's grandparents, parents and siblings, and the siblings children (your cousins).
A paternal name is your father's last name, or his surname. Similarly, a maternal name is your mother's last name, known as her surname and her maiden name (it is her maiden name unless she kept her own name). Paternal and maternal refer to the two sides of your family, your paternal grandparents are your father's parents, and likewise for your maternal parents.