sql - Using the next_day to retrieve the previous day and the following day -

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i have sql code. trying retrieve previous monday , next sunday using next_day function. how make query work? using oracle sql developer run query.

this data want show: 

 fullname,       monday         sunday  john brown      31-dec-2012    06-jan-2013

here code have far:

 select first_name, last_name, dob,  add_months(dob, (extract(year sysdate)- extract(year dob))*12) birthdatethisyear  customers

i tried adding these statements, got error after runninng query: 

  next_day(birthdatethisyear-8, 'mon') previousmonday   next_day((birthdatethisyear-8)+6, 'mon') upcomingsunday

i can try this:

select first_name || ' ' || last_name fullname,        next_day(birthdatethisyear-8, 'monday') previousmonday,        next_day(birthdatethisyear-1, 'sunday') upcomingsunday        (select first_name, last_name, dob,  add_months(dob, (extract(year sysdate)- extract(year dob))*12) birthdatethisyear  customers)

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