Here is another thought.... *warning reeeeeallllllyyyyy long*
I was raised by my grandparents and when I was 5 months pregnant with DD my "Gamer" passed away. They had been married for 52 years and had a wonderful life together and he was right by her side holding her hand as she passed away from breast cancer. This all happened July 7, 2003
Fast forward to Dec. 2004. Daddy is still in a fog (as I'm sure you and your family are) and he just couldn't get into the Christmas spirit. (understandable) So, we invited him to come stay with us and we would take him to Epcot (our treat) It was literally magic what Disney can do to lift the spirits (especially at the holidays). We ambled around listening to all the holiday story tellers and cuddled together and watched the fireworks display at then end of the evening. Sure he missed her, we all still do, but there is really something about that place that does wonders for the spirit. Besides honoring your DH also
use this opportunity to make new memories.
Also, on our last trip (Sept. 2008) we experienced something like what you are referring to.... It was day 3 and we were sitting in Animal Kingdom having lunch (DH, DD, ME and DGFATHER) when DH gets a call. He looks at his cell phone and says "I wonder why my dad is calling me?" I told him to go ahead and call him back, we were just finishing lunch after all and we had a few minutes to spare.... Well, needless to say it wasn't his father, it was his step mother telling him that his father had passed away late the night before. All I could do was cry and DH just sat there in shock. We decided to end our trip early and DD was both sad about leaving Disney and sad because grandpa Dominick went to heaven. Before leaving the next day and heading to Miami for the funeral we went to the Magic Kingdom to convert out 6 day tickets to Fl. resident seasonal passes. DD had a fit and wanted to stop and collect the "glitter" mickey heads off the ground and we just didn't have all the time in the world to do that (we were all super stressed at that point). I went back into guest relations and asked if they had any mickey glitter that they could give DD and they sadly said no, I thanked him and went to leave and the CM asked me if everything was okay.... I proceeded to tell him what had happened the day before and why we were leaving and he said the sweetest thing... he told me that at Disney they try to keep the outside world out, but unfortunately sometimes it sneaks in. He took DD by the hand (w/ me) and went to the gift store right next door. He let DD pick out a stuffed animal of her choice and he found some packed Tinkerbell glitter and gave it to her telling her that Mickey was very sad about her loss and that he hoped that the stuffed Simba and glitter made her feel better..... (I'm tearing up writing this). I know it made DD happy but it really touched my heart.
On day 1 go to guest relations and tell them your story and maybe they can help you. Hugs and prayers to you and your little ones....

. God Bless and have a wonderful trip.