Such sweet responses to your twin news by your little boy, Tess!
We haven't told our kids yet (I have a 4 1/2 year old and a 2 year old) - because I live in an apartment above my workplace (a big overseas school) and it's a small world. My boss lives 2 floors down and it's been tough keeping the news secret (we are good friends with him and his family) - so we definitely can't tell our son until we leave for winter break (which is only a bit over a week away!).
I'm so excited to do so - he's going to be thrilled! Our daughter (2) won't understand until I start getting a bit bigger, but my son will get it right away. He's been mentioning that we should have more kids and often tells us that we should have at least 4 babies, maybe more. (Luckily, we agree!)
This morning, he snuck into bed with us after he woke up and he said this, "Mommy, I've loved you my whole life! I'm so glad you and Daddy marry. Then you found some kids and they are Leo and Rosie and you kept us! I love Rosie too. We all love Rosie a lot."
Then he gave me what he called some - "Nice kisses."
I pretty much thought I'd died and gone to heaven.
I too also want to be careful because if we lose the baby, it will make Leo very sad... but in the end, I also feel like he would want to share in that with us. He's prayed with us for all of our friends who've had losses - and some pretty significant ones - and he's learning through it what death is, what loss is, and how to cope with sadness... those are not easy lessons, but ones that are good to learn in the context of a loving family.