I've found that if I do a search for a relative and find they are living with (say) John, Mary and 2 others, I can easily find the details of all these 4 people by going to Advanced Search, putting nothing in the name field, but entering the parish and the full name of my relative in the 'Other household member' boxes at the bottom. It has come back with a list of my relative's housemates and no others. Perhaps I've just been lucky with smallish parishes and relatively uncommon surnames but it's worked like a dream for me. Useful for checking the people in a household (their full names, year and place of birth) of more distant relatives, where I can't justify paying for the image.