Nature v's Nurture

I was always one that thought that boys and girls behaved depending on how they were raised, but how come I have 2 girls (9 & 5) who are proper girly girls, they seem to have fairy dust that follows them with all the glitter that is thrown around,they play princesses and school and are so engrossed in paint and sequins that it looks like an explosion in a factory,

Then comes along my son (2)( who's daddy is admittedly a footy nut but the football is mainly on in the evening after bedtime) who thinks nothing of using the lounge as an inpromtu football pitch and really boots the football (maybe another Gerrard on our hands), who sits under his highchair pretending to be in a car driving, and then lies under his trike with pencils pretending to fix it like a mechanic.

Maybe its a genetic link as Hubby used to be a mechanic but changed jobs before son was born, who knows, all I know now is that I now have Princesses riding round on Thomas the Tank Engines, and still go skating on a strategically placed car every now and again - ahh well crash helmets at the ready!!