The only problem I could see with these being a sibset of four is [name]Charlotte[/name] and [name]Everett[/name] rhyming, but otherwise, I think they are good names. [name]Olivia[/name] is a name that I really like, but is a bit too popular for me.
I also like that all the names could have nicknames if you like. [name]Dom[/name], [name]Nic[/name], [name]Rhett[/name], [name]Ever[/name], [name]Liv[/name]/[name]Livvy[/name], [name]Charlie[/name], [name]Lottie[/name].
[name]Charlotte[/name] and [name]Dominic[/name] go well together as sibling names. I agree that [name]Charlotte[/name] and [name]Everett[/name] shouldn’t go together because of the “ett” endings. I love [name]Charlotte[/name], too, and don’t really care that it’s so popular!