I honestly dont know aibu? My sister had my little niece 4 months ago, since birth he has been healthy, not had any issues or health problems. However, she is very possessive and doesn't like anyone holding the baby. She is very reluctant to let myself or my other brother or sisterr hold her, to the point where it has been awkward on a couple of occasions. At his christening, she didnt let one single person hold him and refused anybody that asked. None of us smoke or drink, we all wash and sanitise our hands before we even go near him. She won't let anyone that smokes in the vicinity of my niece, she won't let them go near her belongings, or be in the same car or same room as my niece. She hasn't let me children- one of which is a teenager- or my brother's children (who are of a similar age and a bit younger) hold her yet. When I have tried to quietly mention that it would be nice to have a cuddle she becomes defence and says the baby is tired etc, even though he is wide awake!! Its starting to become an issue and I dont know what to do. If I say something I am worried that it will cause a rift, as when I have gently mentioned things before she has gotten very defensive. There is no backstory, we have always been close- i have three children of my own so I know what it feels like to have a baby and also how to look after them! Just any advice, as I dont want to hurt her feelings but I am sad as I just want to get close to my little niece.