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Found this info on son, Henry, of your Maurice Maguire & Mary Sloan.

Henricus MAGUIRE - born 3 June 1857 / bapt. 9 Jul 1857
Parents, Mauritii? MAGUIRE & Maria SLOANE
St. Patrick (1857) No. 1520

Entry of Marriage - General Register Office (Civil)
Marriage solemnized 25 Apr 1881 St. Nicholas Chapel (Catholic), Liverpool
Henry MAGUIRE 23 years bach. Occup: Tailor res: Duncan Street - father, Maurice MAGUIRE, Tailor
Margaret MERNER 23? years spin. res: Clayton Square - father, Nicholas MERNER (deceased), Gardener
Witt: Thomas FLANNERY & Bridget (X) MORAN

According to 1881 Census in Liverpool
Henry MAGUIRE was born Liverpool & his wife, Margaret MERNER was born Dublin, Ire.

1881 Liverpool
No. 28 Duncan St.
Boarder) Henry MAGUIRE unm. 25y Tailor born Lpool

1881 Islington, Liverpool, Lancashire
Neptune Hotel - No. 2 Clayton Square
Margaret MARNER 23y Chambermaid born Ireland, Dublin
Bridget MORAN 23y Chambermaid born Lancashire, Liverpool

Same Margaret MERNER?
Margaret Merner b 2-Nov-1855 bpt 11-Nov-1855
BOOTERSTOWN BLACKROCK & DUNDRUM, Co Dublin
Parents: Nicholas Merner & Catherine Kelly   
Sponsors Joseph Leary & Elizabeth Weddock

I believe Henry went to Boston Mass. area by 1883 were his son,
Maurice George MAGUIRE was born 1887 & wife, Margaret died same year.

Massachusetts, Boston Passenger Lists, 1848-1891 (LDS FamilySearch site)
S.S. "Missouri" arrived Boston 21 Sep 1882
MAGUIRE Henry 25y Born: England Occup: Laborer

See Massachusetts vital records LDS FamilySearch & Ancestry.com

Henry Nicholas Maguire b June 1, 1883 (Boston Births)
at 14 Benton - Father, Henry J. born England, Tailor / Mother, Margaret born Ireland

Births registered in Town of Andover (Essex Co.) Mass.
#72 - 18 Jul 1885 - Catherine Mary MAGUIRE born: Andover
Pts: Henry & Margaret (MERNER) res: Andover, both born Ireland

Births registered in City of Boston (p. 108)
#4828 - 19 Jul 1885 - Catherine May MAGUIRE
Place of Birth: "at Andover"
Pts: Henry J. (Tailor, born England) Margaret (born Ireland)

Maurice Maguire b Mar 30, 1887 (Boston Births)
at 86 Bickford - Father, Henry J. born Ireland? Tailor / Mother, Margaret born Ireland

Henry M.? MAGUIRE died 4 May 1887 (Boston Deaths)
age: 4y at 86 Bickford - born Boston / Parents: Henry & Margaret born Ireland

Magaret MAGUIRE died 14 Sep 1887 (m. n. MARNEA) (Boston Deaths)
born Ireland, age: 30y at 86 Bickford
Spouse? Henry / Parents, Michael & Margaret born Ireland

Deaths registered in the City of Boston
23 Jul 1888 - Catharine N.? McGUIRE age: 3y born: Andover
Diphtheria 1day Childrens Hospital 54 Bickford St.
Pts: Henry born: Ireland & Margaret born: ditto

Marriages City of Chelsea, MA
Married 8 July 1890 by Henry T. GRADY Cath. Priest Chelsea
MAGUIRE Henry J. res: S. Boston 31y Tailor born: Ireland Pts: Maurice & Mary (his 2nd mar.)
McCAIG Mary res: Chelsea 29y born: Scotland Pts: Patrick & Mary (her 1st mar.)

Boston - Out of Town Marriages
Married 8 Jul 1890 by Henry T. GRADY at Chelsea
Henry MAGUIRE res: Boston age: 39 Occup: Tailor born: Ireland
Pts: Maurice & Mary
Mary McCAIG res: Chelsea age: 29 Occup: Dressmaker born: Scotland
pts: Patrick & Mary

Appears you have cousins in the U.S.

There is a tree on Ancestry - Maguire Family Tree / Owner: muggwire
Maurice George Maguire
Birth 3/30/1887 • Boston, Massachusetts
Death 4/1948 • Lowell, Massachusetts, USA

U.S., Social Security Applications and Claims Index
Maurice G Maguire b 30 Mar 1887  Boston, Massachusetts d 25 Apr 1948