Thank you for your query to the Ireland Reaching Out message board.
I have a copy of the death record for Sarah Magee that you refer to but it shows her age as 74. It also noted that her son, George Magee was present at her death.
I also see a church marriage record for Sarah Magee and Samuel Parker in 1869 at St. Mark's Parish. I attach that record also. The marriage record for John Magee and Catherine Skelly is from the parish of St. Peter's.
It would seem that some of the family remained in Dublin if your family visited them in the 1950s and 1960s. If you have other names, you could trace them in the 1901 and 1911 Census records. The link for the Census is below:
A trade directory might be helpful and we have a Dublin volunteer who is well-versed on that as well as maps. I'm going to ask him to reply to you also.
If you have any further information, please feel free to share it. You may also want to add your Ancestors to the Ancestor Profiles on the XO Chronicles tab at the right top of the page, and please feel free to do so.