My SIL does some really shady things sometimes:

1- A few months ago my husband and I bought a pretty dress as a gift for our niece, daughter of his brother J. Our niece spends a lot of time with my SIL R (her aunt) and sometimes spends the night at her house. When we went to visit my SIL we brought my niece's gift thinking she would be there, but there was a change in plans and the girl would be coming over the next day. My SIL told us to leave the gift at her house and she would give it to her. No problem.

This past weekend we went out to dinner with the family to celebrate someone's birthday and J brought our niece wearing the dress we bought her. One of the cousins commented on how beautiful the dress was, and asked J and his wife where they bought it. They had no idea, only that it was in a bag of clothes when the girl came back from a sleepover at R's house. So R put our dress in our nieces bag with the rest of her clothes, and didn't tell them about it, didn't tell them it was a gift, didn't tell them it was from us, nothing!

R heard the conversation, the least she could have done was to step in and say it was a gift from us, she had a chance to correct it but said nothing! I look at my husband and he was talking to someone else so he didn't hear it. I wanted to say it was from us, but didn't want to seem petty or stir up drama so I kept quiet..

2- and this is not the first time, a year before we left another gift for our niece at her house. That time she gave it to her and told her it was from us, but the girl never took the gift home. It is still at R's house with all the other toys she keeps there for her visits. WTF??

3- so when R gave birth to her daughter last year, my other brother in law was temporarily living abroad. We went to visit him while R was pregnant, and he sent back a gift for her baby with us. When R gave birth, we went to visit her at the hospital, and brought our gift and his gift. After opening both gifts, she immediately called her brother to thank him, and then spent the next 40 minutes on FT with him showing him the baby and chatting, completely ignoring us! On the way home in the car, I checked my FB, and noticed that R made a post with a picture of her brother's gift, thanking him, but absolutely no mention, picture, or thank you for our gift that we given and opened at the same time.

I would not care if it was one instance, but there seems to be a pattern here where our gifts are not appreciated, and there are more examples of things like this (not involving gifts) where she treats us differently than other family members. My husband doesn't even notice, and when I bring it up he says I'm being petty. but am I?? Hard to just get over it when it happens over and over, any thoughts?