May I ask, what are your sources? What records do you have so far? Will you please post full details about dates and places and transcriptions of your records? Where you don't have the info, sometimes it's helpful to say that (otherwise we might think you just forgot to mention). Thanks.
Here is a summary of the family:
FATHER Matthew O'Connor born X year in Quebec, Canada
MOTHER Mary Bradley O'Connor born 02 Feb 1855, Co Donegal, Ireland
This couple lived: where? when? his occupation was what? Their dates of death? (death dates are relevant so we don't search for people after a given date)
CHILDREN Mary M O'Connor dob 1879, born where? Nellie B dob 1883, born where? Jennie F dob 1884, born where? Jane F dob 1885, born where? Anne F dob 1886, born where? James J dob 1888, born where? Nessie Elizabeth dob 1890 died in 1954 - where? married who? Kathryn J dob 1892 died in 1972 - where? married who? Anastasia dob 1893, born where? Mabel C dob 1895 died in 1982 - where? married who? Geneive A dob 1897 died in 1943 - where? married who?
Each person (each child in this family) might be near the other, so info on all of them is relevant. On the other hand, this is too many people to search for all at once.
May I suggest you post a separate query for each of the children? That way, you can really focus on that person and tell the forum all you know about him/her. As it is, you have bitten off such a big chunk, that you are condensing your information, and thus volunteer researchers are left not knowing as much as you do about each person.
You'll want to educate your volunteer researchers, bring them up to speed with where YOU are at in your search, so that forward progress can be made - rather than researchers just repeating what you've already found.
The above list contains many clues that you are not in the dark entirely, you have done some preliminary work, and you will indeed be able to expand what you share with the forum.
As you focus on each person, you can comment on what is lacking. For example, a day-month-year of birth and place of birth is just about ESSENTIAL to searching for a woman. Her name will change as she reaches adulthood and marries - so we end up searching for a "Mary born about 1879" or a "Nellie born about 1883."
Can't be done. No person can be identified on so little information. Therefore, volunteer researchers will have to first "ground" these individuals by developing a specific place where they were and when, as children (they can be identified then because they are in a "clump"). See where I'm going with this? I think you've already done that.
Working as a solo researcher is a little different from leading a collaboration. Hope this helps explain what I personally find valuable as a volunteer researcher.