I have a very very very detailed journal entry on how W and I told our kids. You can't find it cause my old threads are locked now, but I can email it to you if you'd like. You can see what we told our kids and it was based on lots of research by me and talking to a Child Psychologist. Warning: it will most likely bring you to tears to hear how my kids reacted. Normal, I think, but still hard/sad. Let me know if you want it. Also, note my kids are 7 and 4, so not sure what your 1.5 year old would hear/retain/etc.
Nomo
M 39 W 39 M'd 10 yrs; T 14 yrs S7 D4 Bomb 5-8-05 W not working on M 1-22-07; EA 2-22 DB 4-10 S 6-11 No more C Link