Interested If This Nested CASE Statement Can Be More Concise...

All- I'd be interested if any of you could advise as to how the nested CASE statement below could refactored to be more concise. (Works fine as is, but just interested to know!) Thanks!

1    SELECT headcount.person_id, person.last as Lname, person.first as Fname,
2   
3    CASE headcount.coming WHEN 'False' THEN '0' ELSE
4   
5    CASE person.is_adult WHEN 'True' THEN
6   
7    CASE person.is_y_parent_or_kid WHEN 'True' THEN activity_session.usd_per_y_parent
8    ELSE activity_session.usd_per_guest_adult
9    END
10   ELSE
11  
12   CASE person.is_kid WHEN 'True' THEN
13  
14   CASE person.is_y_parent_or_kid WHEN 'True' THEN activity_session.usd_per_y_kid
15   ELSE activity_session.usd_per_guest_kid
16   END
17   END
18   END
19  
20   END AS 'Cost',
21  
22  
23  
24  
25   no_answer, not_coming, coming, wanted, comment, activity_session.act_session_id, for_sale, headcount_id FROM headcount
26  
27   INNER JOIN person
28   ON headcount.person_id = person.person_id
29  
30   INNER JOIN activity_session
31   ON headcount.act_session_id = activity_session.act_session_id