Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
気の毒な婦人を帰し(sorry for nitpicking, as always)
に is more commonly used instead of the first を nowadays.
骨を折る is an idiom.
六蔵の教育に骨を折ってみる約束をして
I promised her(= the poor woman = Rokuzō's mother) to try to put in the effort to educate Rokuzō