Females are notoriously more catty (LOL, good pun!!! )

I doubt that either of them are truly unhappy. They sound very much like human siblings. Their sister is wonderful company when mom is not home, but they want to do everything in their power to show mom just how HARD their sister makes their life. You know how it is....."MOM, she's touching me!!!" "MOM, she's looking at me!" MOM, I wanted that toy!" etc.


Just continue to reassure them both and give them ample attention. Things will be fine, I am sure.