Evelyn and either
Eleanor and
Elizabeth would be fine as siblings.
Eleanor and
Elizabeth are too similar IMO.
As for the names themselves, I love
Eleanor and would consider using it.
Elizabeth is also great. You can never really go wrong with
Elizabeth. I hate
Evelyn a lot. It's harsh and unattractive sounding and it irritates me that it used to be a male name. I do love
Eva and
Eve, though.