@123456kent
Most of your worries are understandably normal.
I'm 33 weeks and high risk pregnancy plus I have gestational diabetes.
I have an 11 yo son and a 2 yo. For me school closures don't affect me, I home educate my son and I'm happy my children can't bring home the virus by maybe being exposed to other children/people. I would have worried more about that than them being home.
I don't think maternities will close, they will just ask who us not urgent not to come. We will still be able to deliver our babies. The worst case scenario I'm getting used to is that I might need to go and deliver without my husband if we have all to stay isolated, in case we can't bring the children to who is to watch them. I'm coming to term with that so I know if it happens I'm not unprepared.
About our parents really there isn't much we can do. They have to follow the hygiene measures and hope they don't catch it. My parents live in Italy in one of the cities with the lockdown, my mum has health problems but I think if I start to over worry it won't help. I have to trust they are sensible in what they are doing and trust God in protecting them.
I find that isolating myself from the outside helps me worry a bit less.
I had the flu over Christmas ( real flu), chest infection, UTI, strep throat, skin infection... all in 2 months, 3 courses of antibiotics so far, so I know my immune system is really low and find that being exposed less to the outside world it's best.
I don't think it's irrational, the situation is not nice and it's going to get worse. I know from what my family back in Italy tells me, two weeks ago they were like us, now they are overwhelmed. So I'm prepared to that. Online groceries and inside activities with the kids( or in the garden).
I hope you can find some measures to adopt that will help you cope better, we need that for our babies and children!
Hugs!