Here is a compilation of the letters I've written for specific circumstances and for specific people who either need a little assistance or a gentle reminder of what we are doing when it comes to preparing for a bris.
First, there's the note for the husband who might be a little overwhelmed with what's been going on. Yes, you are the baby's dad, but you are also a husband to a special lady. Remember that!
Some grandparents totally "get" their role and know how to put everyone at ease and to make everyone comfortable. Some grandparents need this reminder, which includes the disclaimer that if you are the grandparent described in the previous sentence, you can skip it.
Here are instructions for the dad - not as much a letter as much as some final thoughts before the bris.
And for the unique circumstance where there is no bris, there is a suggested way to let family know there can be a celebration without a bris, because the bris will have to be taken care of in a different way at the right time. You can see all of that here