Searching for Johnson family

Searching for the Johnson family.  (Spelling might also be Johnston). William Johnson, my 2nd great grandfather) born 1816 - 1818 range married Anne ____________ date unknown.  (William was the son of William Johnson and ___________ Morrison).  William and Anne had the following children:

James b. Nov. 1845, Ireland married Mary Graham Dec. 24, 1866, in Enniskillen. Emigrated in 1873 to US with his wife and brother William J.

William John b. Feb. 7, bapt. Feb. 18, 1847. Emigrated in 1873 to US with brother, James.

Margaret Anne b. May 31, bapt. July 1, 1849 (my great grandmother) Emigrated to Manchester area in England with parents and siblings and lived there. Married Robert Mitchell (born in Ireland) in 1873.

Elizabeth (also known as Eliza) b. Sept. 11, bapt. Oct. 9, 1853

Mary Anne b. Oct. 21, bapt. Nov. 2, 1856. 2 marriages - to Henry Little, and James McClintock. Emigrated to US with children, after living in Manchester area with parents and siblings.

Robert b. Jan. 23, bapt. Feb. 20, 1859. Emigrated to the Manchester area with his parents & siblings.

Eliza Jane b. Apr. 11, bapt. June 24, 1860. Emigrated to the Manchester area with parents & siblings, then to the US.  Married _________ Duke.

Thomas b July 22, bapt. Sept. 7, 1862. Emigrated to Manchester area with parents & siblings.

William and Anne moved all but the two oldest children to the Manchester area sometime after the birth of Thomas.  After Anne's death in 1871 or 1872, William emigrated to the US to join his two sons. Later more of his children joined him in the Leominster, Massacheutts area of the US.

Can you help me with any further information. Would love to hear from you. Thanks.