Mother of the groom causing trouble with other family members

My Fiancé mum has been interfering since I first met my fiancé she’s been passing little sly comments here and there ,she’s been causing trouble with her daughter who I haven’t met because she lives far away and hasn’t visited when I’ve been down at his mothers . My fiancés mother passed comment on my colour of my coat on the first day she met me she sniggered and we wouldn’t need a torch because my coat was bright enough to guide us , when we told her we’d got engaged she comment would it be a long engagement, when we got the engagement rings she was interfering about how much they cost and which one she thought best to chose. When we went to pick up the engagement rings she passed comment to my fiancé who was scared of high windy weather because he had a car accident where a tree fell on part of his car abs this day was windy and she tried to convince him not to go and she made a point of calling his name before he left and saying to his face with a smirk watch out for falling trees , We had a fall out last year because of the appalling way she was treating my fiancé and I told her I wasn’t having it and I told her the things she’d done that I didn’t like in a nice polite but to the point way she told my fiancé’s dad and he was under the wrong impression and had a go at me but later said sorry because he’d realised she was wrong how she spoke to me , she also got on to her daughter who lives away and caused trouble missing out all the bits she did and saying I had a go at her for nothing her daughter is reactive to situations and she was texting me and pulling me apart to which I said you don’t know the situation and blocked her . My fiancé mother played the victim and wanted me to apologise to her and I wouldn’t because I said everything that was true , I over heard her on a conversation saying she was going to apologised to me because she didn’t have the strength to keep the row up and could my fiance tell madam to get in touch for an apology of her . This made my blood boil and I didn’t get in touch with her she tried to jump on to my fiancés FaceTime call to apologise and I told my fiance I was cutting him off because I wasn’t having it in the end her Husband said to me how we going to deal with this and I said let’s just go back to where we were before and forget about it because I didn’t want a fake apology of her and I wasn’t giving her an apology and I did this to take the stress off my fiancé because it was his mum . This made the wedding plans awkward because she’s so false and I didn’t really forgive her or want to be around her but I did it for my fiancé. His mother got wind of we were going cake tasting and invited herself because my mum was coming.his mother took over the cake testing and her voice was louder then mine and my fiancé’s .Then we were discussing venues for the evening do and she wanted us to have a run down sports and social club and even her husband said that it was a dumb somewhere more classy would be suitable. Myself and my fiancé are paying mostly for this wedding with a few things bought as gift of my mum and my fiancé parents are paying for the dj . Me and my fiancé are having my dog as our ring bearer and his nana on his mums side has recently told us she doesn’t like dogs even though she had dogs in the past and has recently look after her neighbours dog , I asked my fiancé what his thoughts were on the nana and grandads invite and what should we do he said invite them to the evening because my nana will make a scene and we’d had a telephone conversation with them to confirm this with them before they received there invite . The day the invites were sent to my fiancé mother to dish out her mother asked my fiancé mother to open the invite and they weren’t happy , my mother in law took over and said that they would be fine and she could vouch for them both on the day and my and my fiancé insisted that we rather them to come to the evening so that his Nana would be more comfortable and to make it up to her she could see me and my fiancé in the break between the day do and the evening to have one on one time with me and my fiancé . We said we didn’t mind his nana coming to the church and sit at the back because of the dog , my fiancé mother broke this to the nana and grandad and they have now refused to come to the whole thing and they never want to speak to me and my fiancé again , my fiancé mother has got on to her eldest daughter again and caused trouble by crying to her and telling her her version of events. My fiancé sister has been having a go at him and threatening to come and ruin the wedding so my fiancé has had to block her ,she wasn’t going to be my bridesmaids anymore because of the first row so she wasn’t invited anyway but it upset us both that she felt the need to say she was going to come and ruin it . My fiancé nana on his mums side got in touch with her other daughter my fiancé aunt and told her about the evening invite and what my fiancé mother had said we’d said and now there not coming and her children. My fiancé and I are really upset we’ve got seven weeks till the wedding and neither of us want to talk to his mum his mother has been bombarding us both with text and calls and has asked us question about the dj and said if we don’t respond to her she’ll cancel ,his other sister is siding with his mum and saying she doesn’t want every falling out because this is a very important time for her with exams and all her mum wants is the songs we want for the first dance which we’ve already told her a week ago and she wrote it down . My fiancé dad is upset at my fiancé mum for threatening us with no dj and to be honest me and my fiancé are really upset with the build up being ruined to our wedding my question is has anyone else had mother of the heron or bride problem and what did they do about it