Starmama... although i only have one child at the moment, and did get my wish of having a little boy first, i now am praying that the next is a little girl. DH is an only child and his father has 5 brothers. But in saying that, my older sister was the first girl in 3 generations. So it is possible.
A friend of our family tried the tricks to get a girl and she got one so definately give it a go... i will be..
Best of luck