Driving is bad, there are heaps of maniacs on the road (the mainacs are almost all Qatari, other nationalities are bad drivers too by driving too slow/ erratic) but you will not go to jail for 'nothing'. you could go to jail if you deeply insult a Qatari but, mind your manners and you should be fine :-)

I think inheritance will follow Sharia Law whereby your wife gets something paltry and your 4-year old son will get the lion's share. not sure about divorce though...