Also it's ok to say congratulations - people don't always seem to feel like they can say it but at the end of the day, we are still new mummies even if it's much earlier than expected!
I would agree that you should not ask when he will be home...that was one of the worst things people used to constantly ask me and when a baby is so early, it's such a long stretch ahead and nobody knows when the baby will come home.
I'm sure any offers of help around the house would be appreciated - even just washing, ironing or providing a meal now and again because you get so emotionally and physically drained spending all day every day visiting neonatal. I was very grateful any time anyone cooked for us (thank you Dona if you are reading this!) because we ate so much junk those 3 months! Help around the house would let her concentrate on spending time with the baby and not stressing about not getting anything done at home.
I'm sure that because you're even thinking about what might upset her, you'll be sensitive enough not to say things like "You were lucky not to have to push out a big 8lb baby", "at least you won't have to suffer the discomforts of late pregnancy", "at least you will have time to rest and recover while the baby is in neonatal"...these were just a few of the things that were said to me!
And it's ok to say that baby is gorgeous (even if it's just from photos etc), because under all those tubes and wires, they just look like tiny ickle babies.
I would agree with SB22 about visiting - at the beginning I felt like people were just trooping in all the time! They used to come in 2's or 4's, and the maximum people round the cot was 3, so the week I was still in hospital, Alan would be taking 2 visitors to see Sophie, leaving 2 with me, then coming and collecting the next lot...we had 4 passes a day and all 4 were used every day for the first few weeks. I felt like I had no time with my own baby and there was really no time for the 3 of us to be together.
Congratulations on your new cousin
I think it's really caring of you to have come on here to ask these things....you're going to be a lovely big cousin! xxx