This challenge is right up my street, as anyone who read my long and rambling member of the week interview last year may recall:
https://www.wikitree.com/g2g/1427281
Mark Humphrys [[Humphrys-126]] has an excellent pedigree of the Winter horseracing dynasty at
https://humphrysfamilytree.com/Flanagan/winter.html
Nancy Winter née Flanagan, wife and mother of the two Freds, was a niece of Louisa Cosgrave née Flanagan [[Flanagan-2111]], who is already on WikiTree, but not connected. Louisa's husband William and son Liam were respectively President of the Executive Council and Taoiseach (the later equivalent position), so it will be good to get them also connected.
William Hern was from England, not Ireland.
Patrick (Pat) Eddery was Emmanuel Mercer's son-in-law, so connecting one will connect the other, as long as we are allowed to add living individuals.
Similary, Pat Eddery's living brother and the late racehorse trainer Sir Henry Cecil married two Guest sisters.
Sir Henry's parents are on WikiTree ([[Cecil-1118]] and [[Burnett-3816]]) and are connected, with four offspring, all showing as [[private son]]. Sir Henry has Wikipedia pages in six languages, so should be a Notable:
https://en.wikipedia.org/wiki/Henry_Cecil
I have family trees of Pat Eddery and Fred Winter on my own website at
http://pwaldron.info/tng/getperson.php?personID=I45299
and
http://pwaldron.info/tng/getperson.php?personID=I30338
respectively. Feel free to register if you want to see them, but just mention in the notes on the registration page that you are participating in this challenge, and await my manual approval.
I really wish that the powers-that-be at WikiTree would some week choose 11 horsemen and horsewomen as example profiles of the week, perhaps to coincide with the original Derby at Epsom on 3 June or for the Breeders' Cup on 3 and 4 November.