Hi Kevin
Your message is rather old, so I don't know if this will get to you. My grandmother was Mary (Rush) Egan, born in Kilbeagh Parish, near Swinford in 1900. There was a total of 10 children in my grandmother's generation, most born after her, and most emigrated (to the NYC area in the US). Her youngest brother, Peter, stayed in Mayo, but I know that my great-grandmother (Ellen Rush) died near Leeds England in the 1930s or 1940s, so I suspect my Uncle Pete moved there at some point.
In the 1901 census, my grandmother Mary Rush was listed as 11 months old. Her mother was Ellen Rush, 27 years old, and her father was Thomas Rush, 46 years old. Other older children listed were James (4) and Katrina(2). Seems they lived with our great grandfather's mother, a Mary Rush who was 78 at the time. She's listed as "head of household." In another random file for Swinford Mayo, there is a list of people born in 1866, shows a "Martin Rush" born to James Rush and Mary Higgins Rush. That could likely the same Mary Rush in the 1901 census (and I do think I heard of the name Higgins in my family before). My great grandfather was 46 in 1901, that means he would have been born in 1855, so this Martin could have been his baby brother, born 11 years later. Mary Higgins Rush would have been 43 at the time, possibly still of child-bearing age.
I'm still investigating. Incidentally, the 1901 and 1911 census data for Mayo is gradually going on line this year, so you may want to try renewing your search if you're still interested.
Bill