Hi Ob1
I am in the same situation but I am the man. I know that it is hard to say but start off with the kids to ask to go bowling, ice skating, buy car or plan models and build them. Boyscouts did not do it for me, too much activity with dads. EXPLAIN to your kids what dad is going through. The phase he is going through is not a good one, I went through the same and quit a high level job to start working for an NGO sent overseas and later after 3 weeks they told me thanks but no thanks.
Dont force yourself but please listen to me somthing I never have had in over 15 years of marriage:
Good Morning Honey, get up with him and have breakfast. Tell him the you will meet him at work for a "love lunch", tell him that you know what he is going through dont try to do thw what can I help you with all you will do is push him away.
My wife told me 2 hours ago, all you want is to see doctors takes pills and make "MY LIFE" miserable. Great to hear and now you can expect the divorce papers.
I went to marriage therapy, great except that after each session my wife would cry and say all you do is say what you have is my fault, no dummy DUH I want you to participate, tell me how we can make this better, after 11 sessions it was over for me.
I am totally focused on my two boys and being unemployed for the time being have time to think up activities to do on the week-ends boys only we love to go to Borders, drink coco, eat a cookie and reads magazines and books for free.
Be soft but keep yourself moving forward, I presume sex is dead, it is with me especially since my wife found a penpal lover overseas oh well, I dont look for action but I am disciplined in taking care of myself and the boys.
Its hard but if you want to make it happen do put your 2 cents every day.
Best
A