My customary wedding date is on the 1st march 2014. Around January earlier this year, my brother-in-law's grandmother passed away from old age. Now my future MIL says my elder sister cannot come home to my mother's house for the tea ceremony as it will cause a clash of luck to my marriage. I'm very close to my sister and definately wish to have her witness and get involve in all process of my marriage. I've heard of other common taboos but nothing of this sort. Can anyone tell me if it is true that my sister cannot/ shouldn't be present during the tea ceremony?