Oh yeah, Chrom was there. I tend to forget that because he takes the bloody backseat for pretty much the entire game after Plegia.
You're probably the only one that believes that Robin wasn't the center of the plot, what with being the child of the main villain, the final boss, the main plot device and I don't want to make a statement about Robin's part being bigger than Chrom or Lucina's, but at least as big.