A lot of ACS language is like this (householder and/or spouse of householder). Remember that the "householder" is whoever Person 1 is on the survey, and in whose name the house is owned or rented. Everyone else, including spouse, is referenced by their relationship to the householder.
Also, it may be helpful to read the Subject Definitions about what "responsible for" means: provides shelter/food/clothing/day care/etc. They are the child's functional guardian.
The main thing census is trying to measure with the grandparent tables (tables that start w/ B10 or C10) are things along these lines:
- count of children in the care of grandparents
- count of grandparents caring for/responsible for their grandchildren (as in, grandparents who are the householder and whose grandchildren are their dependents...not an elderly parent living as a dependent with the children's parents who are the householders of a multigenerational family. If you're looking for this, look for tables that start with B11 or C11 rather than B10 or C10.)
- The two above by other variables like age of children, marital status of grandparents, disability status, race, etc.
Note that these two main counts are not the same. Some scenarios: A group of 2 or 3 siblings cared for by the same single grandparent. A married couple caring for 1 grandchild. A widowed or divorced grandparent who remarried whose grandchild lives with them and their new spouse (step grandparent?). There are so many more scenarios you can think through when you break down the definitions of each word in the description.
Hope this helps,
Diana