Edward Power was a son of Patrick Power and Mary Sullivan.

A very informed article by Charles Radosta on Patrick says that Patrick, aged four and a half, with his sister Mary and brother Edward sailed from Castletown arriving in Boston after five weeks at sea. Mr. Radosta's article is based on notes he made from a book "FATHER POWER" by Thomas E. Kissling and published by Belvedere Press, Baltimore, Maryland in 1931. 

Castletownbear is known locally as Castletown and also as Bearhaven with its full name being Castletown-Bearhaven. We see that the 3 ton vessel, Vixen, sailed from Bearhaven carrying 89 passengers including Edward, Mary and 4 year old Patrick arriving in Boston on 29 May 1849. Edward and Mary were far short of age 24 but not uncommon for young people to give an older age in case of being refused entry. Edward stated he was a shoe maker. We see on Edward's marriage on 26 Nov 1862 that he was aged 26.

Joanna Tobin was a daughter of Maurice Tobin

Edward Powers (26), a labourer of Dorchester and Joanna Tobin (22), of Dorchester married on 26 November 1862 in Roxbury, Massachusetts.  The Marriage record states Edward is a labourer, born in Ireland and his parents are Patrick and Mary Sullivan.

Children:

William Edward Power, 12 Dec 1863.  Marriage 8 Aug 1898 to Margaret Madden.  William died 1 Aug 1899

Mary Ann Power, 21 Dec 1865

John Henry Power, 17 Oct 1867.  John died on 10 Sep 1868

Margaret Elizabeth Power, 6 July 1868.  died 16 July 1900

Nellie Power,  died 20 Apr 1900

Helena Josephine Powers, 7 May 1871

Johanna L Powers, 9 July 1874

Julia Louisa Powers,  12 July 1874.  Louisa J Powers, aged 21, died on 2 March 1898 @ Brookline
 

Census 1870 for Brookline, Norfolk, MA: it seems that Joanna changed her name to Mary.

Census 1880 for Brookline, Norfolk, MA