They are so harmonious that is strange... I can never have this relationship with my sibling... Not the lovers thing but this [way too good, happy and no fighting relationship], you see.
@Thranyx - I would normally agree, but my uncle's kids are very much like this (not the lovers part ofc), the two older siblings are very docile, and I don't think I've ever heard/seen them get into an actual argument (ofc there is sibling teasing, but never arguing).