Answer:
1) Él es mi hermano.
2) Mi familia es muy simpática
Step-by-step explanation:
We use possessives in Spanish to express mainly possession. If they go before a name they perform the function of a determinant (‘esta es mi casa’) and if they do not accompany any name they are possessive pronouns (‘esta falda es mia’).
For example:
Este es mi coche. (This is my car.)
He estado con mis amigos. (I have been with my friends.)
Este libro es mío. (This book is mine.)