Are you sure they were siblings? Could the information recorded on the census have been inaccurate?
Could they have been sister or brother in laws to the 'head of the household' ?
Many times people did not marry.
1. Because they had nothing to offer a potential spouse, no money or very little, no land, if this address was a farm, the property may have divided between the 10 siblings.
They were planning to move/emigrate and were not at that time in the marrying mood.
2. There was significant political unrest with the question of Home Rule still being widely debated, perhaps they were politically active. Tyrone had a small Home Rule majority, I can imagine many heated political arguments happening between inhabitants of small communities
3. There are other possibilities, they were unpleasant people with habits, behaviour and politics that were unacceptable to to others in the local community.
4. They did not wish to marry, perhaps other marriages within the extended family had not gone well.
The Home Rule movement was a movement that campaigned for self-government (or "home rule") for Ireland within the United Kingdom of Great Britain and Ireland. It was the dominant political movement of Irish nationalism from 1870 to the end of World War I.
