I cannot understand why you might not want your sister in your bridal party, especially if she's been pissing you off lately. But if you don't have her in your bridal party, you may end up putting an even bigger strain on your relationship. I think if you want your relationship with your sis to get stronger than you should put her in your bridal party. You don't have to make her moh, just a bm. that's just my opion.