Family members game:
http://www.english-time.eu/hry/family-tree.php?zpet=dite
http://www.englisch-hilfen.de/en/exercises/snake1/index.php

My, your, ...:
http://www.english-area.com/paginas/possessivesbasico.htm
http://mbonillo.xavierre.com/exercises/eso1/1eso2007/possessives1.htm
http://www.montsemorales.com/gramatica/Possessiv3.htm



's possessive:

https://elt.oup.com/student/project3rdedition/level1/unit2/grammar/exercise5?cc=hu&selLanguage=hu
http://www.englisch-hilfen.de/en/exercises/nouns_articles/apostrophe_s.htm