system
surprised: My sister told me she was going to have a baby! All her other babies were much older so I wasn't expecting her to have more. 
gpt
My sister let us know she was going to have a baby! Her other kids are a lot older so we weren't expecting it. 
human
That must have been quite the surprise. 
gpt
We were shocked to be honest. Then she ended up having two more, one right after the next! 
human
That is so crazy!