I have found many "missing" families. Usually the name has been misspelled. I have had to go through whole towns on census records to find them. One census in Madison county the whole darn carpenter family was listed by their middle names!!! The enumerator must have misunderstood the instructions, dunno. many people were illiterate. I have one gggGrandfather listed in various censuses a Nickson, Nickinson, Nickerson, Nixson, etc.. every census different! With some people the spelling is so far off you really have to look at the given names of family members to "find" them. Hope this helps..keep studying the books line by line and you will most likely find them. Sharon