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Family Ties

I just have two short questions on the features that separate the 
Camarasauridae from the Brachiosauridae? and also, what separates the 
Sinraptoridae from the Allosauridae?     I often see many genera 
"interchangable" between these families.        

It seems to me that if the above mentioned families should be 
separated, that the Lambeosaurinae deserves family status.