V.B.
I was diagnosed with breast cancer in December just before my daughter's 4th birthday (I also have a son that was 19 months old at the time). Just a week after her birthday, I had a double mastectomy and was in the hospital for 3 days. When I got home, I was not able to lift my kids for 2 months. I also started chemotherapy in February, so I've been going through that for several months as well. As for what we told our daughter, we tried to be as honest as we thought she could handle. We told her that I was going to have surgery and that I would be at the hospital for a few days (my M. was here to help, so they had Daddy and Grandma alternating taking care of them and being with me at the hospital). The kids were not allowed to come visit me there and, quite honestly, I was not up for the company (that was really tough surgery!). When I got home, I spent a lot of time in bed the first week or two, so she would come and sit in bed with me and I would read to her or we would watch a show in TV together. That way she could still hang out with me.
When I started my chemo, we made sure we told her that I was getting some very special medicine that would help make me better, but that I wouldn't feel very well when I was taking it. We also prepared her for the fact that I would lose my hair. We tried to ensure that she understood that this was not medicine she would get and that none of the medicine she takes would make her hair fall out! She has adjusted surprisingly well...both of my kids have, actually. I think you need to try to be as honest as possible with your daughter, without revealing the true seriousness of his disease. We really try to keep things as normal as possible around here for them (sometimes easier said than done) so that they feel secure in that.
Your husband's coping is a whole different situation and I'm not sure how to help you there. Honestly, I was pretty immersed in my own recovery that I didn't have it in me to see or process much of what was happening with my family members (i.e. hubby and my M.). I'm sure my husband had his times when he lost it a bit, but he never did it around me.
I think the best way to help your MIL and FIL is to help with coordinating meals, house cleaning, rides to therapy (once he is out of the hospital), etc. There is a non profit organization called "Cleaning for a Reason" that will clean the house while the patient is going through chemo, but I was never able to register on the site. I think they are a bit overwhelmed and maybe demand for the service grew faster than their small non profit could handle. But, it's certainly worth a shot! The website is www.cleaningforareason.org. Another great site that you could help them setup is a CaringBridge site. This will allow them to post information about his condition and avoid having to explain things multiple times to tons of different people. Just send out the link to everyone you want to be informed and they can go there to get the information. That website is www.caringbridge.org. This is also a non profit, so the website is free to setup. There is one more website I found helpful to manage people bringing meals, carpooling my kids, rides to doctor appointments, etc. I did this through a Care Calendar. That website is www.carecalendar.org. This site recommends/requires a coordinator, so maybe you could do that for them. If you can think of any other questions you have, feel free to send me a PM. I hope this is helpful and I'm sorry that your family is going through this. You will all be in my prayers.