I have nearly 10 y/o non-id twin girls whose birthday falls the week before xmas (I know, crap timing)
They are very different - one tomboyish other more dreamy but get on very well like an old married couple and are generally affectionate towards each other.
One of them mentioned she would like a day that she didn't have to share - and I think this if fair enough.
I am thinking we can have "twin day" on their birthday and then allow them to choose a day at any other day of the year to celebrate them and have their party/sleepover whatever. Bit like the Queen used to have an official bday
Any advice?