mystic7,
I'll pray for you. Is the church you go to fairly similar in belief to the A/G. As far as I know 'repeat after me' tongues aren't typical A/G practice or doctrine. It's a kind of 'big tent' organization where they don't police individual congregations over details like this.
You said something about the NIV. Are you a KJV-onlyist, or just don't care for the NIV? It's not my favorite translation, either, but I believe people can be saved and grow if they use it.
I guess I can understand a wife going to a Pentecostal church if her husband is Roman Catholic or there is some huge gap like that. Here in the US, if there is a church split and the in-laws went from an A/G to another Pentecostal church, I don't think that would necessarily cause a lot of division in the family. The churches would have similar core beliefs.
And generally, I think the wife should follow the husband, in terms of geography, church, etc. if they are a family of believers. It's related to submission. In my own country, a lot of women resist (and rebel against) the idea of a wife submitting to her husband.
Based on your experience at that church, do you think when they fellowship late, they are genuinely fellowshipping with each other until late at night? If they are, and you trust your wife, you need not get too upset about that. My wife may come home a bit late from a women's Bible study or after sharing with an individual there, and I know what she's like and I trust her. We've always gone to the same church since we got married. When we were dating or engaged, she started going to my church.
This is something you may just have to wrestle through in prayer. You can tell the Lord why you believe your wife should join you at church and then ask him to speak to her. But be open to listening to direction yourself.
Another thing you could do, if the Lord directs your steps in that direction, is take a job in another city, move there, and find a church there, away from family, where she doesn't feel like she's choosing between you and her relatives. It's a drastic step, but it may be worth the unity in the family.