Question: Who is the full-sister to the retired American Thoroughbred racehorse that was raised by a race horse trainer born July 9, 1941?

Context paragraphs:
Kelly Kip: Kelly Kip is a retired American Thoroughbred racehorse and active stallion.  In a five-year racing career which was interrupted on several occasions by sickness and injury, he ran thirty-one times and won fifteen races, most of them over a distance of six furlongs.  Although won he only once at Grade I level and never won a Breeders' Cup race or an Eclipse Award, he set track records at several major racetracks and was regarded as one of the leading North American sprinters of the late 1990s.  His trainer H. Allen Jerkens called Kelly Kip "the fastest horse I have been around".

Sightseek: Sightseek (foaled 1999 in Kentucky) is a retired American Thoroughbred racehorse and current broodmare.  She was bred and raced by Khalid Abdullah's Juddmonte Farms and was trained by Bobby Frankel.  Sightseek is a full-sister to Quest to Peak, who produced the 1000 Guineas winner Special Duty.

Jerry Hollendorfer: Jerry Hollendorfer (born June 18, 1946 in Akron, Ohio) is an American Thoroughbred racehorse trainer whose notable horses include Eclipse Award winners Blind Luck, Shared Belief and Songbird.  He has the most wins in the history of Northern California race horse trainers.  In 2011, he was inducted into the US Racing Hall of Fame.

Mucho Macho Man: Mucho Macho Man (foaled June 15, 2008) is a retired American Thoroughbred racehorse notable as the winner of the 2013 Breeders' Cup Classic.  He was foaled in Florida and named after the Village People song "Macho Man".  His breeders were Carole and John Rio of Florida, who owned his dam.  His foalhood nickname was "Lazarus" because he appeared lifeless at birth, but spontaneously revived.  He grew to be a very large horse, standing over  hands high.  Throughout most of his racing career, Mucho Macho Man was primarily owned by Dean and Patti Reeves of Reeves Thoroughbred Racing of Suwanee, Georgia.  They purchased a majority interest in him after his first race in 2010, and in 2012 became his sole owners.  In February 2014, Frank Stronach purchased an undisclosed share in the horse on behalf of his Adena Springs Farms, owner of Mucho Macho Man's sire, Macho Uno.  The stallion now lives at Adena Springs and began to stand at stud in the 2015 breeding season.

Mystery Giver: Mystery Giver (foaled April 29, 1998 in Illinois) is a retired American Thoroughbred racehorse best known for winning three consecutive editions of the Fair Grounds Handicap at the Fair Grounds Race Course in New Orleans, Louisiana.  Trained by longtime trainer Richard Scherer, Mystery Giver set the track record at the Fair Grounds in the Mervin H. Muniz Jr.  Memorial Handicap.  Scherer continues to race horses at the Fair Grounds during the winter, while spending the rest of the year in Chicago at Arlington Park and Hawthorne Race Course.

Charles E. Whittingham: Charles Edward Whittingham (April 13, 1913 – April 20, 1999) was an American Thoroughbred race horse trainer who is one of the most acclaimed trainers in U.S. racing history.

Rajiv Maragh: Rajiv Maragh (born July 9, 1985, in Jamaica) is a jockey in American Thoroughbred horse racing.  An Indo-Jamaican, he is the son of a jockey who rode in Jamaica before relocating to Florida where he began a career as a horse trainer.

William I. Mott: William I. "Bill" Mott (born July 29, 1953, in Mobridge, South Dakota) is an American horse trainer, most notable for his work with Cigar.  Mott earned the Eclipse Award for Outstanding Trainer in 1995 and 1996.  He was inducted into the National Museum of Racing and Hall of Fame in 1998 at the age of 45, becoming the youngest thoroughbred trainer ever inducted.  Mott started training thoroughbreds at age 15 and won the South Dakota Futurity with Kosmic Tour before he was out of high school.  He worked his way up the ranks by becoming first an exercise rider, then an assistant trainer for Hall of Fame Trainer Jack Van Berg.  In 1976, Mott, trainer Frank Brothers (who was also Van Berg's assistant trainer), and a stable crew guided Van Berg's horses through the wins at Sportsman's, Hawthorne and Arlington Park race tracks in Chicago.  They were so successful that Van Berg was named leading trainer at Arlington Park and leading trainer in the Nation with 496 wins in 1976, a record that stood until Steve Asmussen broke it in 2003 with 555 wins.  Asmussen broke his own record in 2008 and 2009.  Mott worked as an assistant trainer for Van Berg for three years before striking out on his own in 1978.

Robert J. Frankel: Robert Julian Frankel (July 9, 1941 – November 16, 2009) was an American thoroughbred race horse trainer whom ESPN called "one of the most successful and respected trainers in the history of thoroughbred racing."  He was inducted into the National Museum of Racing and Hall of Fame in 1995, and was a five-time winner of the Eclipse Award for Outstanding Trainer.  Often referred to as "Bobby" by others, he preferred and always used "Robert."  Frankel set the single-season world record for most Grade/Group I victories in 2003 with 25 Grade I wins, a record he still holds.

Kelso (horse): Kelso (April 4, 1957 – October 16, 1983) was an American thoroughbred race horse considered among the best racehorses in history.  In the list of the top 100 U.S. thoroughbred champions of the 20th Century by The Blood-Horse magazine, Kelso ranks 4th, behind only Man o' War (1st), Secretariat (2nd) and Citation (3rd).  In his long career, Kelso defeated many leading Thorougbred racehorses including Carry Back, Gun Bow, Bald Eagle, Tompion, Never Bend, Beau Purple, Quadrangle, Roman Brother, Crimson Satan, Jaipur, Ridan and Pia Star, as well as other top thoroughbreds, often conceding weight under handicap conditions.  In doing so, Kelso beat more champions and Hall of Fame horses than any other thoroughbred racehorse in the 20th Century.

Supporting paragraphs: Sightseek Robert J. Frankel
Answer: Quest to Peak