Just flat out giving a 100m to any human being will likely screw them up - at what age does my kid receive it anyway? I can't fully account for what sort of person they will grow up to be, and what the experience of knowing he's got a 100 mil in his back pocket will bring - it's hard to imagine them living a normal life. I'd take the 30 mil, make sure my family is set (House, insurance, a college fund, etc.), donate ~5 million to a charity I'd decide with my spouse, then throw the rest in a bank.
Oh, and I'd probably buy some gold too.