I am one of 3 sisters all in our 50's. Parents 80 & 82 are still pretty fit & well living independently. They are really quite wealthy (relevant for the topic not a random boast!)
My middle sister was burgled earlier this year and amongst other items had a lots of jewellery stolen that unfortunately won't be covered by her insurers (she didn't ever provide the required proof of ownership or get valuations). We all met at the weekend and she was talking about buying some cheap costume jewellery so she doesn't feel so bare & has something pretty for when she goes out. Our mother then jumped in and offered her a number of pieces of jewellery & my sister swiftly accepted. Some are items she had inherited from her own mother, others items my father has gifted over the years - all pretty valuable and an assumption they would be shared between the 3 of us in time.
I didn't say anything as the jewellery is my mother's to do what she pleases, but I'm really miffed they are now all going to middle sister just because she was was too lazy to complete the paperwork on her insurance! And hopefully we won't have to worry about it, but there is also the potential for IHT issues if she died within 7 years so my DH reckons there should be some formal record of the gift. I haven't spoken to my youngest sis but the look of incredulity on her face suggests she was similarly shocked.
So AIBU & a spoilt brat who should butt out, or YANBU & entirely justified in feeling miffed and Dsis shouldn't get an early inheritance.