Mark West, father of Sarah West

 I am looking for information regarding the family of Sarah West. Sarah left  Galway in 1841 and sailed on the ship, Middlesex. She left with her husband, Luke O'Brien/O'Bryan. They left 6 children in Ireland and 5 later came out to Australia in 1848. They had 15 in total.

There is evidence that Sarah's brother , Henry, sailed with them. Her father's name was Mark West. I would be interested to hear from anyone who has further information of the West or this O'Brien family. Sarah and Luke were from Kiltormer and Laurencetown, but I'm not sure who is from which.