Welcome to RootsChat.
Do you mean you're trying to trace living relatives of your grandmother or are you seeking information about her immediate family in Dungannon, parents & siblings? We can help with the second task but not with the first. RootsChat is for tracing ancestry, not for finding living people.
Are Helen's son and granddaughter alive? If they are, you need to remove their names from your post. RootsChat has a strict privacy policy which does not allow publication of names of, or identifying information about people who may be alive on the open Forum. Click on "modify" at the top of your post to amend the content. You can alter your post within 24 hours of posting. If 24 hours has elapsed you need to ask a moderator to edit for you.
If you haven't already done so, please select the "Help" tab and read "Guidelines for Posting" from the menu on the "Help" pages., in particular the section which begins "Please do not post requests asking for help to find (possibly) living relatives". You'll also find links to topics "Searching for Living Relatives" and "Tracing Living Relatives" in that section.
Have you found your grandmother's birth registration on Irish Genealogy.ie website? This will show her official date of birth, place of birth, names of her parents, residence & occupation of her father + her mother's maiden surname. With that information you may be able to find the marriage registration of her parents + birth registrations of her siblings.
https://www.irishgenealogy.ie/en/ It's free to search. You have to prove you're not a robot and sign in each time you use it.
Helen should be on 1901 & 1911 census. This is also free to search on the National Archives of Ireland website.
http://www.census.nationalarchives/ie/Added. I see that aghadowey has found a family which may be Helen's.
