I recently got married and we had a gorgeous day with friends and family. My sister was matron of honour and her children were page boys. We didn’t ask for gifts as we are a bit older and have everything we need, however most of our guests were very generous and gave us cards/gifts/money etc. Everyone that is apart from my own sister - I was shocked to find that we didn’t even have a card from her and her family. My sister can be quite selfish at times and thinks the world revolves around her, however I feel this is another level - who doesn’t get their own sister a card on their wedding day? Every single other guest - even our evening guests came with a card. I thought maybe something had got lost so I messaged to ask her but she gave me some rubbish excuse about how she had accidentally taken it home with her and she would post it to us the next day - it has still not arrived. AIBU to be upset by this?