Your poor Dad! Although the "cheap" statement makes me think of Tim-the tool man-Taylor.
And poor you, too. Any injury on the bottom of the foot is not only painful but disruptive. It's hard to heal something that you are on all day. And as for bruising - since blood goes to the lowest point to drain, that must have taken awhile.
Our only injurys during home improvements (painting being the most recent) are pulled back muscles! But I think that's a fairly common thing.