Rochelle,
Jeanie & Jennie are interchangeable. My own grandmother was Janet on her birth certificate but Jennie to her family. We have a lot of interchangeable names like that in Ireland, eg Sarah & Sally, Robert & Robin. So that’s all very common. (Likewise in Scotland which is where the Morrow family probably originated in the 1600s).
The owner of the tree I mentioned has William Morrow & Martha Bell as Samuel Morrow’s parents. Here’s a marriage that fits in 1854:
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1854/09465/5429816.pdf
Note that William’s occupation was also a shoemaker. The marriage was in Belfast Registry Office.
Here’s your Samuel’s birth in 1867:
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1867/03467/2273448.pdf
I can see likely siblings, all born Belfast:
Sarah 14.5.1865
Robert 27.2.1870
Margaret 28.8.1872
Andrew 15.3.1876
From the 1901 census, there also looks to have been a Mathew born c 1876 but I can’t see his birth in the records.
Birth registration only started in 1864 in Ireland, so there may well have been other children born 1854 – 1863 but they will be harder to find. You would need to rely on church records. Not all are on-line. That said, I do see a baptism for a Mary Anne Morrow in Belfast in 1858 and Martha Morrow 1860 both with father William Morrow. Likely at St Anne’s Church of Ireland whose records are on-line (pay to view on rootsireland).
William & Martha in the 1901 census:
http://www.census.nationalarchives.ie/pages/1901/Antrim/Cromac/McClure_Street/970174/
Family was Church of Ireland (ie Anglican).
Here’s Martha Morrow’s death in 1909. Informant son William John:
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1909/05446/4523858.pdf
Here’s William’s death in 1908. Informant was daughter Maggie, evidently still single.
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_retu…
Once you get your Ancestry account, there is a facility for contacting tree owners. It looks as though the Crossan family have quite a bit of information and they may be able to provide more that is not shown on the tree.
Given the numbers of people in the Morrow family that I have found from this fairly cursory research, there are likely to be a lot of descendants around today. In general, it’s not IRO policy to give out details of living people but the Crossan family are clearly one set of descendants and they may know of others. Their tree is not marked private so they would appear open to being contacted.