We're always looking for those elusive ancestors, aren't we? I've talked before about Hispanic wives. When their husbands passed away, many times the wives reverted back to using their maiden name only. I've found my ancestors listed in the census under their mother's maiden name and the census taker only used tic marks for their surname which implied that their surname was the same as the mother's maiden name. The same can be true to look for people in the directories or anywhere for that matter. Make sure you're searching for the children using the mother's surname as well as the father's surname. Try both in a different order. You never know. This could help you break your brick wall.