- Half-nephew of Redmond O'Neal, who is mother Tatum's MUCH younger half-brother, the son of his grandfather Ryan O'Neal and Ryan's long term (1979-1997) significant other (they never married), Farrah Fawcett, who died of cancer in 2009. Redmond was born January 30, 1985, which means (half) nephew Kevin is only one year and four months younger.
- Half-nephew of Patrick O'Neal, who is mother Tatum's younger half-brother, the son of his grandfather Ryan O'Neal and second wife Leigh Taylor-Young. Patrick is actually the namesake of Ryan, who's birth name is Charles Samuel Eldridge Patrick Ryan O'Neal III, making Uncle Patrick's birth name Charles Samuel Eldridge Patrick Ryan O'Neal IV. Patrick has fourteen acting credits (the last being in 2007), and was one of the singers performing "(I Wanna Be an) Oscar Winner" during The 61st Annual Academy Awards (1989) (the same Oscar telecast with the infamous Rob Lowe and "Snow White" opening), but is now (as of 2020) a long-time sportscaster with Fox Sports.
- Maternal grandson of Ryan O'Neal and Joanna Moore. Grandfather Ryan was forty-five years old, and grandmother Joanna was fifty-one years old.
- Kevin had a special connection with his maternal grandmother Joanna Moore. who died of lung cancer November 22, 1997. Kevin had Joanna's face tattooed on his upper arm, out of a desire that he "will never forget the influence she's had on his life." He also refers to her as his "guardian angel," and he dedicated his roman à clef novel, "Our Town" (2015) to her, since she inspired the main character Dorothy, which was also Joanna's birth name.
- His appearance on Episode dated 11 August 2015 (2015) was to be interviewed about and to promote his first book, "Our Town".
- Both he and his sister Emily were born in the month of May, Sean on May 23, 1986, and Emily on May 10, 1991, making Kevin four years and 352 days older than Emily.
- Kevin was born May 23, 1986, sixty-nine days before his parents were married.
- Step-son of Patty Smyth via her marriage to John McEnroe in 1997.
- Son of John McEnroe and Tatum O'Neal, who were married from August 1,1986 to (unknown month and day) 1994. John received full legal custody of Kevin and his two siblings in the divorce. At the time of Kevin's birth, John was twenty-seven years old and Tatum was twenty-two years old.
- Nephew of Patrick McEnroe and Griffin O'Neal.
- Cousin of Griffin O'Neal's four children.
- Cousin (some would say half-cousin) of Sophia DeMornay-O'Neal and Veronica De Mornay-O'Neal, daughters of Patrick O'Neal and Rebecca De Mornay.
- Half-brother of Anna McEnroe (born December 27, 1995) and Ava McEnroe (born March 28, 1999). Anna was born almost exactly fifteen months before parents John McEnroe and Patty Smyth were married on March 23, 1997, and Ava was born almost exactly two years after the ceremony. Anna is nine years, seven months younger than Kevin, and Ava is exactly ten years, ten months younger than he is.
- His middle name is Jack, which he used on his book, "Our Town," written by Kevin Jack McEnroe.
- Shares his first name with his maternal great-uncle, Kevin O'Neal (younger brother of Ryan O'Neal) who is an actor born March 26, 1945.
- Brother of Sean McEnroe (born September 23, 1987) and Emily McEnroe (born May 10, 1991).
- Both he and his brother Sean were born on the 23 of their respective birth months, May 23, 1986 for Kevin and September 23, 1987 for Sean, exactly sixteen months apart.
- Grandson of John Patrick McEnroe Sr. and Katherine Tresham.
- Brother of Emily McEnroe and Sean McEnroe.
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