4TH HOUSE - GEMINI—?

What does it mean exactly to have my FOURTH HOUSE in Gemini?
I know a very good amount about Astrology and Natal Charts but I am now figuring things out slowly about THE HOUSES all together!!! Could you please help me out—

BORN:
September 1st, 1987
6:10PM
Montreal, Quebec, Canada

XOXO

http://www.examiner.com/article/the-basement-of-the-soul-the-4th-house

http://astrobix.com/hindu_astrology/post/gemini-4th-house-4th-house-gemini.aspx

http://www.llewellyn.com/journal/article/2301

http://www.astrology.com.au/astrology/houses/fourth-house.php