At 10 they will have some idea of how the world wags, especially if they had a relative die 5 years ago in the same unit. In fact you might find that they are already worrying along those lines because of this previous history.
There's nothing you can do except sit them down tell them what's happening, and ask them what they need to know. Tell them the answers to everything you can, and stand by to catch them if they need it.
Sorry to hear your sad news, and I hope things are not as bad as they may seem at the moment.