Hi Chevrolet, I got married last year and my family fell out on my big day too. They hadn't gotten on for ages anyway but decided to try and put things to one side for the sake of my big day, my mum and step mum even met eachother prior to the wedding day and everything seemed to be going swimmingly until some dispute kicked off after the wedding breakfast involving my mum, 2 aunties, an uncle, my nan and my step-mum.... I think!
I didn't let it ruin my day, and although my dad tried to keep it from me I knew something had gone on (the atmopshere was pretty obvious). As far as I was concerned though, it was mine and my husband's day and it could have been a lot worse, all I was concerned about was having my family there, that's what mattered to me.
It would have been nice if all parties could have bit their tongues for the sake of one day, but I didn't expect any less and at the end of the day I had a good time, despite what others may have been up to.
Please try to always keep your daughters feelings at the forefront of your mind - if she wants you to give her away, please do not let other conflicts tell you to do otherwise. it is her big day after all, even if you give her away and then make a quiet exit, at least you were there for the important part. Don't let her mother ruin what should be a special day for you too.