1 - does the members of both crews get inter-changed for every race or after specific number of races?..or the crew for both drivers remains same for whole season?..
No, not really. Maybe a very small number might move from one side to the other but the main people don't change. They not only remain same for the entire year, but in some cases for the entire duration of a particular drivers stay with the team. The crew as in people who change tires etc are pretty much the same or might rotate for what ever reason but not the important folk.
2- who chooses which crew member to serve which driver?...is driver involved in it?..
The team decides not the driver. For example at Ferrari, Alonso has inherited the crew that looked after Raikkonen, including his race engineer, Andrea Stela. At Mercedes, they decided to keep Jock Clear away from Schumacher, although he is the senior guy there but there is a history between the two. Jock Clear was Jacques Villeneuve's engineer at Williams. We know what happened between Villeneuve and Schumacher in `97. There are Videos of Jock Clear on Youtube, using quite a colourful language when talking about Schumacher. So the team management decided it was best to keep the two away. Jock Clear is Nico Rosberg's race engineer as a result. Once settled in, the driver if he is a successful one and a big name, he may ask for someone to be changed but we are talking about drivers of the stature of Senna or Schumacher.
3- when we talk about nepotism in the team, is it possible to have a rift between members of both crew because of it?...or its just driver specific..and that crews play a neutral role?...
That varies from situation to situation. In 2007, the famous Alonso-Hamilton/Dennis saga, His crew ( Alonso) stayed loyal to him through out the season and there was animosity between his crew and Hamilton's side of the garage.
In some cases its the opposite. Some drivers are let's say very paranoid about these things. There are many instances, the most famous F1 rivalry, Senna-Prost, had reached a level where not only the team, team boss, but Honda got involved too and clearly favoured Senna. Ron Dennis goes around saying how he handled Senna and Prost, but from what one reads, it's only in his head. He was handled by Senna, who made the team his own. So much so-that anyone old enough to have watched those years will forever associate Mclaren as Ayrton Senna's team.
The British press lives on that kind of stuff. What i like about the situation, and i wrote that in one of the previous replies, is that the team everyone expected to have massive problems doesn't seem to be having any despite the pass into the pitlane in China. The press was waiting and even predicting days and weeks when it would happen. As it turns out, It's happened at all the other three teams except the one people expected it to happen.
Things are not good at Red Bull, yes the media is playing it up but there is so much happening. Like for instance, this latest interview by Horner. Would it not have been better to just shut up and move on? No, he feels like he needs to talk to the media for some odd reason. Sights like last week were a common occurrence at Williams during Montoya-Ralf years but they went about it in a professional manner.
True, Vettel should not be penalized for Webber being in fuel save mode but then he, Vettel, should remember that and not expect anything from Webber at the end of the season, should he need Webber's help. It's as simple as that. Plus, he put or tried to put a pass on Webber, he should be prepared for the consequences too. He made a mistake and he is the one who gets out of the car gesticulating that Webber is crazy? In today's F1, with millions being spent on teams and drivers, once they get into a 1-2 formation after their last stops ( which is only one pitstop these days) they more or less hold station and bring the car home.
Things will not be fixed at Red Bull anytime soon, if at all. There was no realistic pressure from Hamilton around that time. I think James Allen wrote on his blog-that the gap between Vettel and Hamilton was very steady in the five or seven laps before the incident between Webber and Vettel. Quite honestly, Horner needs to shut up. They are a joke, having changed their stance a dozen times already.