That is correct; it should be the entire list of "direct" parents based on the depth you are querying. Select where parent in 1 will only get direct parents of 1, so in order to get the children of 26, 10, and 24, they have to also be listed.
It seems strange to me that there is `modResource`.`parent` IN (1,26,10,24) in the query, when there should only be one parent (1)? (1 is the id of the resource - a container - that uses the template containing the call. 26,10 and 24 are children inside that container.)