I know that once my FI and I are married, his nieces will be my nieces too.
But I feel bad that I have a hard time calling them my nieces. We just recently got a picture of his brother and sister-in-law's new baby girl and I shared it on my Facebook (with the parents permission) and put the description as X's new niece instead of our new niece.
I had a few people ask my why I didn't say it was our niece.
I wonder if his nieces living at least 6 hours away (and seeing them maybe once a year) has anything to do with it. Some live almost a full day's drive away.
Does this make me horrible? Is it something I will get used to in time or that maybe I will feel different about / come more easily / naturally to me after the wedding? Did anyone else go through this?