家人 - jia ren - Family People
你家有几口人? - ni jia you ji kou ren? - How many people are in your family?
我 - wo - I/Me
妈妈 - ma ma - Mother
爸爸 - ba ba - Father
奶奶 - nai nai - Grandmother
爷爷 - ye ye - Grandfather
姐姐 - jie jie - Older Sister
哥哥 - ge ge - Older Brother
妹妹 - mei mei - Younger Sister
弟弟 - di di - Younger Brother
口 - kou - Measure word for the total number of people in a family
有 - you - have
两 - liang - 2 (always use this before a measure word instead of 二。)
Explain
If you want to say how many people are in your family you would use 我 then 的 which makes it possessive (me into mine or you into yours) then 家 which is family then the number of people in your family then 口 which is a measure word and then 人 which is people so if you have 5 family members then you could say 我的家有五口人。You could also list your family members by using commas and 和 which means and.