Your situation is quite challenging since these children are not your own. Your time should be devoted to each child equally, which does not seem to be possible. If ignoring and sending out are not productive a star chart for good behaviour may be; obviously you cannot single them for this treatment and I realise it may be challenging with all of them. If every child receives a star at the end of the lesson for good behaviour (it is important to inform them the stars are for behaviour and not dancing), the disruptive twins will soon realise they do not have as many stars as their friends.
I don't know if it would be possible, but splitting them in two different classes may also benefit as they will not be able to feed off each other nor look to each other for support. Putting them on either side of the class may also help.
I know it is never acceptable to favour one child over another; however, should one behave a little better than the other in a class, praise her for it. The other will soon try to catch up to your good graces.
It is always more beneficial to praise good behaviour than react to poor behaviour in any way.
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