[tryton] tryton report [getting values inside a many2one of another many2one]

[haw . gavino . hg]

hi i got this 2 models thats is related by a many2one but i cant get the 
second set of value.. ill try explaining it below by codes




i can do this in report

<for each "row in object">
  
  <for each "lines in row.someMany2Many >

       <lines.name>
       <lines.age>

   <for/>
 <for/>

------------------------------------------------------------------

but this one i dont know if its possible.. well im having an error

<for each "row in object">
  
  <for each "lines in row.someMany2Many >

      <for each "data in lines.someMany2Many >

       <data.parents>
       <data.grandparents>

       <for/>
    <for/>
<for/>



its like i want to get data's in    currentModel --> Many2Many ---> 
Many2Many


please help