Elizabeth (Brereton) Carrington, Legh died April 12, 1497. Sir John can't be born of said mother after she died.
Then a date is wrong, I don’t know which - do you? The relationships are sourced:
http://www.archive.org/stream/recordsociety58recouoft#page/152/mode...
Philip Leigh of the bouthis coossen & heire male 18 H. 8. = Elizabeth daughter of Sr Andrew Brereton.; ch: Sr John (m. Jane Snede),