I'm getting married soon and there's 6 of us on the top table. My mum has to go on the end so I was planning on having the grooms Mum on the end too to even out the table. His mum keeps going on and on about how she needs to sit next to him and has told me twice to change the table plan or she will just swap the seating arrangement herself. She even wants to come to the setting up the day before to "help" This is making me want to keep things the way I want them even more! She's also a very fussy eater and has complained a lot about what she can and can't eat and how she's going to be starving all day and doesn't like the menu we chose. I wanted her further away from me so I would not have to hear all this and ruin my day. How can I make sure she stays where I put her?