WHG I would wait until you have told the kids and than write it. I think there is way too much information in the letter. I think the reason for such letter is for the school to look for behavior changes in the kids.
M 53 D 20 Separated 6/22/11 moved out 10/24 Together 26 yrs Married 16 W Filed for D 7/21/11 Served 9/6/11 D final 8/28/12
“Failure is not fatal, but failure to change might be.”