Passed through Randalstown on Tuesday and Wednesday this week.
Had a quick look at IGI which is on Mormon website (familysearch.org) and there are lots of Pearsons in Co. Antrim.
Samuel Pearson & Ellen Percy had:
1. Mary Ellen 2 Apr.1871 Co.Antrim
2. Margaret 29 Apr.1875 Ireland
3. Matilda 28 Apr.1873 Ireland
4. Henry 17 May 1879 Aghadlongham, Antrim.
The last entry gives you the name of a townland to search further- Randalstown is probably the nearest village and/or district for civil registration.
Also in Randalstown dist., David Pearson & Margaret Fulton had: David (1864), Mary Jane (1866), Samuel (1869), Nancy (1872).
And, John Pearson & Margaret McAteer had: Isabella (1867).
If you search through the records yourself you might find more information. Good luck.