MM... ill try and answer some of your questions... others might disagree but here goes.

Unless considered "mahram" which basically means people you cant marry, social mixing of sexes is not usually allowed in muslim culture. When the sexes mix in a non social context, women will be covered.

Most women WILL have met the brother in law, but again she would be covered (usually only the face and hands are exposed) and it would never be alone. Another family member would be there.

Dating as seen by western cultures is not allowed. However, engaged couples may be allowed to go out to public places together in the company of a chaperone (usually a member of the girls family). In fact, this is very similar to, say, victorian britain's culture.

Older generations are the same the world over. They will always think that times were so much harder in their day, and that "kids these days dont know how lucky they are"

Arranged marriages are still the norm here. However, it is common for the bride and groom to talk to each other and see each other beforehand. Alot of marriage to cousins takes place as the background and family of the couple is seen as very important. Its more a marriage of families than just individuals.

Brothers and sisters go out regularly.

Qatar does have seasons, though u might argue its only two... summer and winter. It doesnt get very cold (nowhere near 0 Celcius), but having acclimatised to a sweltering summer, 10 degrees is relatively cold. Deep inland deserts can dip below freezing at night though.

Hope that helps
GIASI