oh ggglimpopo, I'm so sorry to hear this, and sorry for your dh and you in the loss of your fil, it must be an incredibly anxious time for you. I have a friend who had a 27weeker and a 28 weeker and both are fine, but I'm not denying it was extraordinarily stressful for them both for months after the birth. I'm sure you know but the key thing is that every single day you can keep the baby in counts enormously. and every single ounce the baby weighs counts enormously. so you really do have to rest, and you really do have to stay horizontal so the baby gets as much blood as possible and therefore puts on as much weight as possible. If I were you I would really be on almost complete bed rest - so difficult I know.
The other thing you really have to be aware of is that if you do go into early labour, because the baby is so small you have a very much increased risk of cord prolapse, which clearly is very dangerous for the baby. So if you do feel you are in proper labour, you should have a feel up you to make sure you can't feel any cord popping out of the cervix, and if so call an ambulance IMMEDIATELY and keep your rear propped up high in the air (praying mantis style) so relieve pressure on the cord. They will probably keep you in this position all the way to hospital. Don't want to scare you but it is a relatively common thing to happen with preemie babies and managing it properly can make the difference between brain damage or not.
Poor you. But the main thing is that they do wonderful things with very preemie babies these days especially once past 27 weeks. Hang in there! Good luck xx