We co-sleep a bit oddly these days - I sleep w/ds (8 mos) and dh sleeps w/dd (4 yrs) for some part of the night most nights. I want dd to be able to join us in our bed for the true family bed experience, but dh worries about the two kids sleeping near each other (dd wants to sleep next to me rather than on the far side of dh). I do the old "nursing flip" so ds sleeps on both sides of me. What age do you all think it is appropriate for sibs to sleep side by side?