No one knows exactly how sexual orientation and gender identity determined. However, experts agree that it is a complicated matter of genetics, biology, psychological and social factors. For most people, sexual orientation and gender identity are shaped at any early age. While research has not determined a cause, homosexuality and gender variance are not the result of any one factor like parenting or past experiences. It is never anyone's "fault" if they or their loved one grows up to be LGBT.
If you are asking yourself why you or your loved one is LGBT, consider asking yourself another question: Why ask why? Does your response to a LGBT person depend on knowing why they are LGBT? Regardless of cause, LGBT people deserve equal rights and to be treated fairly. - See more at: http://community.pflag.org/page.aspx?pid=290#sthash.LKLUekOW.dpuf