Does the membership just allow for one person or the whole family? Without a membership how much is it to get into each museum?

15 dollars per person for all three or 4 museums to include the the car museum the prison and the two across the street. The $15 is a year long pass. I believe 10 and under are free.

Its all one museum it was 15 per person when I went but I think it was cheaper for children.