Actually, the first patch didn't pay attention to children, if any, of
the current headline. Here is a new patch, including feedback from Kyle
and Sébastien.

Considering the following buffer, "Text" being the matched location

    * Grandmother
    ** Uncle
    *** Heir
    ** Father
    *** Sister
    *** Self
        Text
    **** First born
         Other text
    **** The other child
    *** Brother
    ** Aunt

`minimal' is

    * Grandmother
    *** Self
        Text

`local' is

    * Grandmother
    *** Self
        Text
    **** First born

`ancestors' is

    * Grandmother
    ** Father
    *** Self
        Text

`lineage' is

    * Grandmother
    ** Father
    *** Sister
    *** Self
        Text
    **** First born
    *** Brother

`canonical' is

    * Grandmother
    ** Uncle
    ** Father
    *** Sister
    *** Self
        Text
    **** First born
    **** The other child
    *** Brother
    ** Aunt

`full' is

    * Grandmother
    ** Uncle
    ** Father
    *** Sister
    *** Self
        Text
    **** First born
         Other text
    **** The other child
    *** Brother
    ** Aunt


Regards,

-- 
Nicolas Goaziou