I've really enjoyed reading this thread, too.
My husband and son just passed the two year mark not that long ago. I have to say that all three of us have adjusted remarkably well. The toughest part, imho, was the driving thing (although my husband might say it has been the language). My husband never drove in Nepal... in fact, one can not reach his village by any kind of vehicle. They walked or took public buses everywhere. When they first got here, he practiced driving my (manual) truck around our (very small) yard. Finally, we just got an automatic. I was having all these visions of him drifting into intersections in the path of oncoming traffic as he struggled to get the truck into the proper gear. Poor thing... I taught him to drive. He drives OK now (a bit like grandma), but I still worry about him all the time and I am a terrible passenger. Still.
You can imagine all the cultural differences. Our home is a real hybrid place. We eat dal bhat tarkari (rice, lentils, curried vegetables) with our hands quite often, but we also have pizza, spagetti, sandwiches and other American stuff, too. The stereo plays Nepali folk songs and American top 40 & rap (our son... groan). Our garden gate and chicken pen clearly were not built by an American carpenter!
I used to ask them all the time: "do you miss Nepal?" "do you feel lonely?" "do you miss your family?" "do you miss your Nepali friends?" Occasionally our son will say he misses playing with friends in the village, but he has always expressed a preference for the US. My husband doesn't seem to miss his friends and family nearly as much as I would have expected. He lived away from them a lot in Nepal because of his work.
Our marriage is solid because there is a deep mutual respect in addition to love and affection. Most of the time we don't have to work hard to communicate well, but when there is misunderstanding, we drop everything until it is settled. I think having a foundation in Buddhism in common helps. This marriage is practically the opposite of my first marriage, and that's a very good thing!
The richness my husband and son have brought to my life is immeasurable. Adjusting to stepmonsterhood has been a real learning experience, but so worth it. And connection to one's community takes a quantum leap with a child in the school system. I never had time to have a nice garden and my husband has created such a beautiful garden for us, it is the envy of the neighborhood! And for someone who lived for 9 years on her own, with all that freedom, I have found sharing a small space with two other people surprisingly wonderful!
The occasional trip back to Nepal is a fantastic perc as well.
I feel so lucky to have them in my life.