So ever since I met my fianc I knew he and his mother had an extremely strained relationship because of the way she raised him she basically tortured him until he turned 18 and moved out and even then she continued her antics. He is not close with his family at all but they still are in contact in fact we just got back from vacation with his family which we thought was a bad idea from the start but went a long anyways and realized it was in fact a miserable trip unless it was just the two of us. Anyways over vacation I realized that the potential for his mother making both of us completely miserable on our wedding day and throughout the planning process is highly likely and practically inevitable my fianc and I discussed this last night and he is in 100 agreement in fact he reminded me that she has successfully ruined ever major event in his life from graduation to accepting awards and other degrees. I really do not want her there at all but on the flip side we both love my family and he is very close with my brothers and my dad and I want a somewhat traditional wedding in the sense of having the first dance and father daughter dance but I am not opposed to going away. Is there any way I can avoid her at the wedding I don't even want her talking to my guests or is there some way we can set her straight up front or just not invite her at all. I appreciate all responses.
side note she has never been diagnosed with a mental illness but we are and most everyone else who has met her believe she should be on medication.