Spoon&Fork

Personally speaking, I think that is enough evidence considering you've only been married 3-4 mos ago. I was nervous at first about the evidence we were going to present, or lack thereof. But I think most interview officers are already inclined to notice whether the marriage is genuine or just a scam. Each interview is not really the same as what others had and can't really be compared. Just be yourselves, answer confidently and I'm pretty sure, you'll do just fine. Good luck!
 

My thoughts, and these are just that, are that anything that shows an "liability" for your spouse (or the parents) can be used. I would say that the changes of parents willing to get there in-laws a phone would be slim if there was not a genuine marriage. Same with the health insurance, car insurance, credit cards and so on. It all shows that your partner is running a financial risk for you and that is something couples are not likely to do if the marriage is a scam.