Update for 2/20/2013: Mares both got their 9 month Pneumabort shots today. Toffee's udder is starting to show changes - very slight, but that is just fine for now! Toffee is also looking very wide! I need to get some photos but the ones I have taken recently aren't very good. Dancer's girlish figure is starting to broaden too, but gosh, she is at 9 months so I guess it is about time!! Her baby is pretty active anyway. My vet (who is my age) has been told because of his age he shouldn't try working for 10 weeks after his accident, so that may put him pretty close to the mares's due dates. But he should be able to get around enough to help somewhat if his help is needed. So far, he has saved two of our 5 (ever) live foals, who probably wouldn't have made it without his help.
BTW, we have a video somewhere of their older brother Rusty more or less riding on the sled with his front feet, and walking with his hind legs. It is pretty funny!