You aren't unreasonable. I'm sorry you've been going through this, and very sorry for the situation for the children whatever it is.
Over the last decade or so we've been through a lot in our home including death, cancer, special needs, a medically frail child and single parenthood. And I'm only in my late 30's. Some families sadly go through much trauma. A dear friend just lost their second baby from stillbirth. All of their friends go home from hospital with babies. Many of those same friends never ever contact them.
What I've learned with time and perspective, is that hard situations can make you a much better friend and member of the community. If anyone in my circle is facing hardship now I'm round with meals, baked goods and a hug, texting to see how they are and offering help. Because that's what I needed.
I had many lovely friends who were a great help and I'm so so appreciative. But I will say a couple people dropped me in a very painful way. I never heard from them again. No condolences. No offers of support. No asking if I was okay and how the children were coping. In fact the weekend we left the hospital one unfriended me on facebook. This is a very respectable person, loved as a good soul in our Mum's group, a very nice lifestyle, is a teacher at the local primary. A couple mutual friends were aghast and without my knowing mentioned something to her and her response I've since found out was "well we don't have anything in common anymore, best to move on". Charming response (mutual friends horrified on my behalf by the way) and her response is one I would never have expected from a fellow mother. It's strange how people don't want to put themselves in your shoes and for a moment imagine the pain you are in. The other friend who did the same thing just has a very easy life, lots of luxuries and support, and I noticed despite the fact we were long term friends they really only hang out with couples like them - middle class, the budget for nice things etc. I no longer fit that bill. My child whose medically fragile couldn't meet at the community park for us all to play tennis with the kids like we used to - nothing fancy, just a park open to everyone that we used to often meet up at as a family, maybe once or twice a month for a match and a nice walk, a coffee/tea etc., or lager etc. We didn't see them for two years. Two years. We have a civil relationship but I'm not in a rush to get back to closeness. Nor do I wish them anything but goodness in their lives. I'm happy with the odd text and I still send their dc birthday cards. I probably get a text from them 3x a year, despite the fact her in-laws live a mile up the road, their children call me Auntie and we saw them at least twice monthly and used to have joint family dinners for Christmas and Easter. The only window I got into it was my friend saying "nothing has ever gone wrong in my life so I don't know what to say". And it's true, they are both from loving families, they both have good jobs they got through parent's contacts, they had no infertility, no special needs, never been in need, have jobs with good benefits and bonus', enjoy a couple holidays a year, can afford a weekly baby-sitter so they can go out, have involved and loving grandparents. They have no reference for suffering.
With many years behind us now I really think that some people are unable to cope with negative and challenging situations like in some way it will harm them, and other people are very good at playing the great friend, until serious things happen, and then that pretence can't be kept up. I am very lucky that we have such lovely friends, I volunteered to give back and help others in our situation and met so many lovely parents there, as well as friends from our primary school, neighbours, co-workers, people I've met dog walking and even people we've met by holidaying at the same cheap but lovely family run guest house. I moved away from where I grew up but also have friends a fair distance who check in and send me lovely uplifting texts full of love and kindness.
Make a community, know that you deserve better than friends like the one above, and go and be that great friend to others. I've come to see though it's hard to always remember, that once people show their crap to you, while it's shocking, it's best to move on, accept you are hurt and then remember it's their issue and you may never know why.
Wishing your family well.