Thank you so much for all the replies which are very helpful. The lead from aghadowey about the workhouse is particularly useful as I think there's no doubt that this is the Patrick McPartlan who married my great grandmother. I'm still struggling to find the dates of death for both Patrick and Mary but I assume the latter was still alive in 1911 as the Census entry shows Patrick as married rather than widowed. The lead about Abigail's birth was also really interesting and solves the problem I had in not finding her birth. Mary Bradburn was obviously quite a one.
I didn't put every detail down in my earlier post to try and keep it short but in fact I have traced all the sisters and the brother to their various deaths in California (Emily Jane), Canada (Mary and William), Scotland (Charlotte Anne), New Zealand (Hannah Frances) and England (Abigail and Sophia). I'm not sure any of them were Home Children as in the 1911 Census I found entries for Abigail (Bournemouth, England), Charlotte Anne (Glasgow, Scotland), William Henry (servant in Cavan), Mary (servant in Drumcondra), Emily Jane (servant in Dublin), and the two youngest girls in Clifden. Certainly apart from Abigail and Charlotte who I know little about, they all seemed to have had quite sad lives.