Hi! Welcome 1111! It definitely sounds like you belong here.
CollinsMum made some good comments. Feel free to ask any questions you have as they come up. It seems like there's always someone who has BTDT and can relate their experience for you to consider. And, by all means, spend LOTS of time searching previous posts. You'll find all kinds of relevant posts on sensitivities, school fit, how giftedness appears in younger siblings when compared to older siblings, asynchronous development, etc.
Sounds like you have some wonderfully exciting kids. Enjoy!
