Question: What is the nationality of Alexa Ray Joel's mother?

Context paragraphs:
Baby Grand: "Baby Grand" is the fourth and final single released off Billy Joel's album "The Bridge".  A duet with Joel and Ray Charles, the song is a ballad dedicated to the baby grand piano, and the relationship it can share with its players.  The two originally got together when Charles contacted Joel about the naming of his daughter, Alexa Ray, after Charles.  Charles then suggested they create a song together.

Joel family: The Joel family of England was headed by three brothers, Jack, Woolf and Solomon, who made a fortune in diamond and gold mining in South Africa.  Their father was Joel Joel (1836–1893) and their mother Catherine "Kate" Joel "née" Isaacs (1840–1917), a sister of Barnett Isaacs, later to be known as Barney Barnato.

Alexa Ray Joel: Alexa Ray Joel (born December 29, 1985) is an American singer, songwriter, and pianist.  She is the older daughter of singer-songwriter Billy Joel and first child of model Christie Brinkley.  She released an EP "Sketches" (2006) and several singles on independent record labels.  She has performed at numerous charity events and New York City fashion events, and in 2010 was chosen to be the spokesmodel for Prell shampoo.

Joel Lehtonen: Joel Lehtonen (11 November 1881 – 20 November 1934) was a Finnish author, translator, critic and journalist.  He was born in Sääminki (now part of Savonlinna).  His childhood was fatherless and poverty-stricken, his mother suffered from mental frailties and Joel himself was forced into paupery.  Joel's foster mother supported his schooling and Lehtonen was able to study literature for a few years in the University of Helsinki, but dropped out without completing a degree.

Joel Dexter: Joel Dexter is a fictional character from the British Channel 4 soap opera "Hollyoaks".  The character debuted on-screen during the episode airing on 22 November 2011, portrayed by Andrew Still.  Still was attending the Scottish Youth Theatre when Lime Pictures presented the establishment with a casting opportunity for "Hollyoaks".  The actor secured two auditions for the role and after the second audition he was offered the part.  Joel has been characterised through themes of violence.  He is on probation for assault, and he loses his temper with various characters.  Despite this, Joel does not like domestic violence because his step-father hit his mother.  His dislike of such violence played a role in his early storylines.  He was written out of the series in 2012 and departed on 9 January 2013.  On 18 August 2016, it was confirmed that Joel would be returning to "Hollyoaks" with the role recast to Rory Douglas-Speed; he returned on 8 September 2016.

The Downeaster Alexa: "The Downeaster 'Alexa'" is a song originally written, produced, and performed by Billy Joel for his eleventh studio album "Storm Front".  The album itself went to number one while the fourth single "The Downeaster 'Alexa'" placed at #57 in the "Billboard" Hot 100.  The song was included on Billy Joel's "Greatest Hits Vol.  3" album in 1997.

Christie Brinkley: Christie Brinkley (born Christine Lee Hudson, February 2, 1954) is an American model and actress.  Brinkley gained worldwide fame beginning in the late 1970s with three consecutive "Sports Illustrated Swimsuit Issue" covers through 1981.  She spent twenty five years as the face of CoverGirl (the longest running cosmetics contract of any model in history), has appeared on over 500 magazine covers, and has signed contracts with major brands—both fashion and non-fashion.

Moroccan nationality law: Moroccan nationality law is the subject of the Moroccan Dahir (decree) of September 6, 1958, official Bulletin Number 2394.  In general, Moroccan nationality is transmitted by filiation (father and mother) or birth in Morocco.  However, it gives the right to Moroccan males to transmit citizenship to their children and foreign wives, and since the last update, that is possible for women.  The aim of the update was to follow Morocco's recent human rights reforms, most notably the Moroccan family code called, "Mudawana", which aimed to fight gender inequality.  It has been done after much debate in the media.

Lullabye (Goodnight, My Angel): "Lullabye (Goodnight, My Angel)" is the seventh track and third single from Billy Joel's 1993 album "River of Dreams".  It was inspired by Alexa Ray Joel, his daughter by Christie Brinkley.  The song is in the key of G major.

Attila (rock band): Attila was the name of a band featuring a young Billy Joel.  Joel was a member of a band called The Hassles; he and the drummer, Jon Small, broke away from the Hassles and formed Attila in 1969.  The instrumentation was organ and drums, with Joel also handling the bass lines with a keyboard, similar to the Doors' Ray Manzarek.  Their creative partnership ended in 1970 when Joel ran off with Small's wife, Elizabeth, although this did not end their collaborations, as Small produced Joel's "Концерт" video as well as the "" performance.

Supporting paragraphs: Lullabye (Goodnight, My Angel) Christie Brinkley
Answer: American