I'm 25 My fiancé has a very small family to begin with. My family is HUGE on both sides. For him, it's his mother, younger brother, (21) and younger sister. (18) He has 2 other uncles who are married with kids I barely know.   I get along with his mom and brother great. The younger sister has made it clear she hates me, and wants nothing to do me. My fiancé, his mother, and I all have discussed about the sister; and my fiancé and his mother for years have told me to ignore her. She has said every horrible thing you can tell someone, will throw my jacket and purse on the floor during family events behind my back, cyber bully me, and all that. SHES 18! It goes on and on its been miserable. Her and my finance never had a strong relationship before I was involved to begin with.  Now comes the wedding planning. I have 3 biological sisters that are automatically apart of my bridal party and I know for sure my finance is asking his brother to be his groomsman. That leaves his 1 sister not being apart of the wedding.. She doesn't respect me or our marriage to begin with but I obviously cant NOT invite her.. I have to respect my fiancé's family (especially as small as they are!)  I don't know what to do! This is my day, but I want everyone to feel included and happy but that girls only brought hell.  

Does the celebrant meet the couple at the courthouse? Does the couple go to the celebrants office? Vows in a civil ceremony?