Mary Cruise was born around 1841 in New Jersey, according to Louisville KY census records. [Further research MIGHT show her to be Mary, the daughter of Matthew and Rosanna Cruise of Newark NJ. Both born in Ireland, according to the Newark 1850 and 1860 censuses. In 1860 Matthew was a policeman, b ca 1815.]
Around 1859, place not known, Mary married Dillon Mapother, and had six children by him. He reportedly died around 1874, and she married in Louisville on 28 Feb 1876 Thomas O'Mara, who was born in Tennessee or Kentucky around 1835. He was a druggist, and appears to have had at least three children by previous marriages.
On 29 Dec (or Jul) 1876 Thomas O'Mara (Jr.) was born in Louisville. Sometime before 1900 his name was changed to Thomas Cruise Mapother. Actor Tom Cruise was reportedly born Thomas C. Mapother IV, and it has been claimed that he changed the spelling from Cruse to Cruise. Cruse may be the spelling used by some census takers, but "Cruise" appears on the WWI draft registration card of Thomas C. Mapother I.
See Ward Harrison's remarks athttp://www.bbc.co.uk/wales/northeast/sites/flint_town/pages/...
See also the submission on Thomas Cruise Mapother/O'Mara at Rootsweb's WorldConnect Project.
Immigration records show Dillen Mapother, engineer, age 18, arrived in New York City 2 Jan 1850 from Liverpool aboard the ship "Wisconsin". His place of origin was listed as Ireland, and most census records list his birthplace as Ireland.
1850 CENSUS, NEW YORK, N.Y.
Fifth Ward, p. 458, 24 Aug 1850
DILLON MAPOTHER 18 England, civil engineer
1850 CENSUS, JEFFERSON CO KY
Louisville, Ward 7, 17Aug1850, p. 366
(All in following household were listed as born in Ireland. Birthplaces on censuses are not always correct.)
MARY B. O'MARA 50 widow
Thomas O'MARA 14 [Whether this is the Thomas O'Mara who married Mary Cruise is yet to be determined.)
John ROBINSON 50 collector
Isabella ROBINSON 15
Mary O'MARA 11
Mary BURKE 23
1860 CENSUS, JEFFERSON CO KY
Louisville, Ward 3, 2 Jul 1860, p. 105/709
DILLON MAPOTHER 28 Ireland, lithographer, value of real estate $9000; value of personal estate $4000
Mary 19 NJ
Mary 4 months KY
Ann McCARTY 11 England servant
Mary McCONNELL 28 England servant
Louisville, Ward 7, 21Jun 1860, p. 55/447
THOS. O'MARA 25 TN druggist
Ellen 22 KY
1870 CENSUS, JEFFERSON CO KY
Louisville, Ward 7, 5 Jul 1870, p. 133/67
D. H. MAPOTHER 38 Ireland, lithographer. R.E. $1000; P.E. $5000. Both his parents were of foreign birth.
Mary P. 38 (First digit should be 2) NJ. (No marks in blocks labeled "Father of foreign birth" and "Mother of foreign birth.")
D. E. 8 KY male
H. H. 6 KY male
G. B. 1 KY male
Annie DONLEY 20 KY cook
Hester DONLEY 12 KY nurse
Louisville, Ward 9, 22 Sep 1870, p. 56
THOMAS O'MARA 35 TN druggist. Both his parents were listed as of foreign birth.
Alice J. 25 KY
Mary E. 9 KY
Alice M. 3? KY
Francis M. 1 KY (female)
Clifton McGINNIS 35 KY druggist
Mary WARD 35 KY
Maria MARTIN 40 KY cook
1880 CENSUS, JEFFERSON CO KY
Louisville, ED 128, Page 23 (479), June 1880
THOS. O'MARA 45 head KY IRE IRE wholesale drugs
Mary 37 wife NJ IRE NY
Thos. 3 son KY KY NJ
Dellia MAPOTHER 18 KY IRE IRE clerk in store
Wible MAPOTHER 7 (male) KY IRE IRE
Henry MAPOTHER 16 KY IRE IRE
The birthplaces after the Mapother children's names should have been entered as KY IRE NJ.
The relationships of the Mapother children to Mr. O'Mara, the head of the household, were not shown.
The book "Finding Your Famous (and Infamous) Ancestors", by Rhonda McClure, available at Amazon.com, is said to contain some of Tom Cruise's ancestry. I haven't seen this book yet, and don't know whether it outlines Mary Cruise's ancestry.