Need help with antique footstool repair

[JSUPreston]

The last picture tells a lot about how it was originally supported. Why not make the replacement block in a triangular configuration and as wide as possible less a tad (just under a skosh). You will have the entire back of the most narrow portion of the leg supported and it won't be visible. I'm in the glue only camp. Although phi1l makes an interesting observation about the quarter sawed cut of the wood, I have seen wood glue demos and have never seen the original break separate. JMO, FWIW

If it were me, I'd do this on all the corners. I figure, if you've got it apart and know where the weak spots are, go ahead and fix them all so that hopefully you won't have to do it again for a long time.

Also, I think just using glue on the broken piece is the best idea. I would be afraid of splitting the parts or not drilling the pilot holes right to add screws or dowels.

[phi1l]

The last picture tells a lot about how it was originally supported. Why not make the replacement block in a triangular configuration and as wide as possible less a tad (just under a skosh). You will have the entire back of the most narrow portion of the leg supported and it won't be visible. I'm in the glue only camp. Although phi1l makes an interesting observation about the quarter sawed cut of the wood, I have seen wood glue demos and have never seen the original break separate. JMO, FWIW

The danger here is not that the glue joint will fail, but that the whole area is weak, & is likely to break right next to the repair.