I've had some difficult conversations with kids about their parents being incarcerated. There's a small booklet called How to Explain Jails and Prisons to Children: a Caregiver's Guide. It's done by the Oregon DOC, but it's general enough that it might help people in other states, too. Here's a link
http://www.oregon.gov/DOC/PUBAFF/docs/oam/explaining_prison_for_print.pdf

Colorado offers a large booklet called Parenting from Prison that offers ideas to prisoners for staying connected to kids (infants to teens). This page has a form that you can fill out to have a hardcopy sent to the prisoner and also has a link to download it as a .pdf
http://www.ccjrc.org/parentingform.htm
Again, many of the ideas are general enough to apply to prisoners in all states.

That is so cool, thank you for sharing .

I am new to this. Now my fiance has been locked up before. He has served like a year or two. He has never been down like this. He is facing 11-25 years with the Feds. My daughter is only 7. Their bond is so close. I did not really know how to talk to her to help her truly understand. So think you.