Go to Google images and you can see how Joe Pa changed his toupees over the years. He added grey to his toupees, so it wouldn't look so obvious and ridiculous that he wears one.
Yes he does wear a toupee, and his son Skip is bald.
No
yes
Michael Landon did not wear a toupee. He had a full head of his own natural hair.
Yes
Yes
Yes.
You betcha
Yes
yes
Yes
yes