I recently got engaged and am starting to finalize who I want in my wedding. I have 2 sister-in-laws one is very new to the family and the other one has been around for 18 years. I am not really close or really care for the newest sister-in-law and I really don't want her in my wedding party. If I ask her I have to exclude a childhood friend, who i am still to this day very close with. I am extreemly close to the SIL that has been around for ever, she is a sister to me. How do I go about not asking the new one to be part of the wedding party with out causing anamosity with my brother, sister-in-law and myself?