Matthew John Gibbons is on Geni as being born 23 April 1846
His father [Matthew John Gibbons [Free Settler "Minorca" 1801, Free Settler "Saracan" 1820] Matthew John Gibbons [Free Settler "Minorca" 1801, Free Settler "Saracan" 1820]] died in 1832, 14 years before he was born
His mother Charlotte Selena Gibbons - Dangar died in 1835, 11 years before he was born.
What is the source of his birth date and him being their son?