I have a brother and a sister. Have a good relationship with my sister , not super close but we are always regularly in contact and always share family events together. My brother on the other hand has always had it out for me, constantly been provocative, causing family issues and arguments. Pretty sure his wife thinks she is above the rest of the family (not really sure what she bases that on). He also literally bullies my elderly parents which horrifies me. All came to a head about 3 years ago when we argued at Christmas. It became slightly physical with some pushing a shoving. Had nothing to do with the campaigner ever since. Why do these family divisions occur and why are they so hard to resolve?