Let's start with the word mom, mom. Let's start with Mom and Dad. Mom.  Dad. Mom. This is my mom. This is my mom. Dad. Dad. This is my dad, this is my dad.

 Older brother. Older brother. Younger brother.  This is my older brother,  this is my younger brother, this is my older sister. Older sister. This is my older sister. Younger sister. In English we do not usually say 哥哥弟弟. Oftentimes, we will say this is my brother, this is my sister. 哥哥 or older brother，弟弟 younger brother. We can also say how many siblings, how many brothers and sisters we have. I have three sisters and two brothers,  two older sisters or three older sisters. I have three sisters, and two brothers.

In English we say grandma.Grandma. For grandfather, our father's father, or our mother's father - Grandpa or grandfather.  This is my grandpa.