My fiancee and I have been together 3 years. His parents passed away before we got together so his sister is his closest family member. She hasnt liked me since day one. Mainly because she was VERY good friends (and still is) with his ex. Shes always making snide comments to me. Him and I are buying land together, when talking about it she tries to stress that its HIS. When I casually say "ours" she will say blah blah blah HIS. When we fight, she always has the worst advice to give him (yes, he tells me) I asked him not to go to her with our problems, but he does anyways. Also when we are fighting, she will come to my fb page & try to give me "advice" like just leave him alone, give him space, you need to move on. The latest thing she did was comment on an album on fb of pics with just me & him...I said something joking about what his facial expression meant & she said "nobody knows my brother like me...." & went on to say what she thought his expression meant. To me, thats just trying to take another jab at me (I know him better than you do) theres been MANY other things. I ask him to nicely say something back, but he just says "shes family and i dont wanna make her mad" Shes almost 40..is this childish of her to keep doing this or childish of me to let it bother me?