If it helps any, there were only 4 households in Drumhome in 1857 - three were in Rossnowlagh Upper or Crockahany (thats the actual name of the townland) and one of those Hanna households was headed by a William. Also, this Catherine may be related to your William - Catherine Hannah, 20 years old, daughter of William, married John Farrell, son of Thomas - recorded in Rossnowlagh. She is of the right age to be a sister, has a father with the same name and lived in the same area. The only Andrew Ritchir who was the head of his household in 1857, in Donegal, was Andrew Richey in Creevins, Inver. Sorry I don't have any more than that. All the best, Lindel PS I'm pretty sure Meg didn't mean that William's wife was Mary Ann Doe - she was giving an example of what the entries for the mother should have looked like - it usually is written Mary Ann Hannah ms (maiden name) doe or do, which would indicate that Mary Ann's maiden name is the same as her married name............it doesn't look like her maiden name was recorded on the marriage for William and Eliza as the 'ms' is not written on it for Mary Ann