2009 Tax Credit unable to buy from "Close famly"

I am writing to you as a very upset residence of the  state of Virginia. I know there is a tax credit for first time home buyers that purchase a home in 2009. i have read all the terms of how you can qualify for the tax credit. I understand that the credit was created to help boost the downfall in the housing market. It does state that the government wants people to invest into buying a home. Of course people want to buy a home and start their lives by raising a family and own their own home. But it isn't fair that "Jane Doe" has the opportunity to buy a house, but the only thing is that it's her parents house. She wants to grow old in a place where she was raised and know and love. How is it any different than "John Doe" just buying some random person's house than her buying her parents house. As i was reading the terms it just states can not buy from a close relative. Well what would be the reason? It also states that you can get the credit if it is a step-relative, but what is the difference?  How come "Jane Doe" not be able to pick the house she wants, which her parents have agreed to sell to her. They all make sense, but how is it fair that "Jane doe" not get the same credit for buying her parents home?