I've just watched all 4 episodes on catch up as I didn't realise it was on. I think in general the parents and children are a lot more normal this series.
I think Julian is possibly not as arrogant as he comes across - he only learned English fairly recently and he has a bit of the Eastern European confidence etc. DS2 has a friend from Romania and one from Latvia - they are lovely kids but can come across in a similar way.
I actually don't mind Giovanni's dad that much although he is trying to live his own life through his son to make up for what he missed out on. And it is possibly just the editing but I do find the total ignoring of Giovanni's sister a bit off putting.
Thomas does come across as a true brainiac whereas some of the others (the brothers for example) come across as bright but pushed.
The programme does highlight for me the hunger for immigrant families in particular to work hard to make sure that their children get any opportunity available. It's a lesson that some of the rest of us should probably take on board a bit and is the best advert for some good immigration that I've seen.
Roll on the final.