What I worry about most (ok, just ONE of the things I worry about) with Cole and Charlotte in daycare (/childcare/preschool) is that they will not be able to build a brother-sister bond the way that they would had I been home with them these past couple years. I worry and then I happen to overhear Cole say to Charlotte "Charlotte do you want me to read a book to you?" and I see them climb on the couch and proceed to "read". Cole asks her questions about the pictures and prompts Charlotte to say what the picture is or what sound the animal makes. It's moments like this that I know they are ok and have developed a bond on their own.
And they are not apart from each other all day. When they are outside in the morning and the afternoon (for hours) sometimes I find them playing together when I pick them up or just hear from them that they had played together during the day. So this makes my heart happy.