Juni, I'm curious as to how this is going.
The twins are starting pre-k next fall and we've been discussing this recently. We're having a tough time making a decision. The school has told us that it's totally up to us.
Initially I thought that surely we'd just keep them together unless a problem developed. That with them being opposite sex twins they perhaps wouldn't struggle as much with identity issues.
But we're seeing in their preschool class that Sam is very hesitant to complete anything on his own. Their teachers describe it as a lack of self confidence which I somewhat agree with, though I do think he's "behind" Mary Beth. I use the quotes because she's very precocious ... so it's not as if he's truly delayed, kwim?
She colors within the lines where as he could give a shit less. She wants to learn to write her alphabet properly and spell things (she sees her older brother doing this with his homework and it's killing her that she can't yet

) where as he's just not interested at all.
In fact, we can't really tell
what Sam's interested in. We're having the hardest time with him for Christmas.
So on that note, I think it would be good to separate them in case Sam's feeling pressure to perform like his sister. But the thought of separating them (this is stupid, I know

) makes me sad.
Sorry for the length
I know we still have plenty of time to decide and that we can always put them back together the following year (or any year thereafter). But we've just been discussing it lately and DH feels we should separate. He's probably right. Just thought I'd get some thoughts from other moms.