Not by blood.
No. Peter Billingsley's mother is Gail Billingsley, who is first cousin to Glenn Billingsley, the first husband of Barbara Billingsley.
no
Yes
I just asked the same question myself... If you type in A Christmas Story it will give you a full list of the cast. I didnt realize he played Andrew in the movie "The Break Up" with Vince Vaughn and...