Abstract: A vehicle seat support structure includes a vehicle body structure, a support frame of a seat assembly and a support bracket. The vehicle body structure has a floor that at least partially defines a passenger compartment. The support frame of the seat assembly is installed to the vehicle body structure such that at least a portion of the support frame overlays the floor. The support bracket has a pair of child seat attachment portions and a frame attachment portion. The support bracket is fixedly attached to the vehicle body structure with a portion of the support frame connected to the frame attachment portion.