George Cornell (Connell) - Unlikely birth year

Grissell did not marry Samuel Cornell until 1684, after the death of her first husband, Thomas Fish. Preserved Fish and Mehitable Fish - who are George's older half siblings - was born in 1679 and 1684, respectfully. We do not have the exact date of their marriage but Grissell, heavily pregnant (or just had given birth) and with several young children, appears to have married Samuel Cornell very quickly (recorded as just 1684) and would have had Thomas Cornell a little more than a year after Mehitable. George was probably born before or after his brother Samuel. Grissell was 41 when she had Comfort, so I doubt George was born after his sister.