If you want to revise your English vocabulary, here is a list of vocabulary of members of a family and some exercises:
Now practise what you have learned with this quiz.
If you are having problems with the possessive s, it's worth having a look at these websites.
Possessive s 1
Possessive s 2
If you want to test your grammar, click here and take the first four tests (Grammar Lessons 2, 6, 10, 14).