He was a very good friend, kissingfrogs-still is today and we used to go on holiday with them. They saw each other lots out of school, and at playtimes. I didn't want them in the same class, he was too dominant.
I haven't had twins, but as we have them naturally, in the family I gave it a lot of thought. I also knew quite a lot of twins as a child and I felt so sorry for them being 'the twins' and never Anna and Louise.
They are in school for 6 hours a day and in the classroom for about 4 and a half hours a day for 5 days a week with at least 12 weeks holiday. I hardly think it constitutes a separation. It gives them a short time to explore being on their own.
If I had twins I was determined to let them choose their own clothes and I would have hated parents to always think, we are inviting Anna, we have to have Louise. They are two different people.
If they have a close bond, nothing can break it and they should be able to cope with one going out socially without the other. Why should someone who is best friends with one always have to have the other tagging along?
Anyway I haven't had twins so I haven't had to do it. My DCs also haven't had twins as friends and so we haven't had the party dilemma.
I would say the school and the parents need to discuss it-there isn't a rule.It depends on the individual.
I know that as a very shy child, it wouldn't have done me any good to always rely on a brother or sister and not fair on the brother or sister. However-before anyone shouts at me-that is me. I am not telling anyone else what to do.