They asked you their name and how old they are so :
J’ai deux sœurs : [your sisters name + her age, and the second sister + her age] et un frère [his name and his age]
1- il y a
2- c’est
3- il y a
4- il y a
5- c’est
6- ce sont
7- c’est
8- c’est
9- c’est
10- c’est
11- ce sont
12- il y a
Answer:
"China is the largest country." Means in french: "La Chine est le plus grand pays."