Hi Martin < My relative Major ?Captain Charles Jones 1783-1843 , 15th hussars and ADC to the king of Hanover fought at Waterloo.
He went on to kill himself >>>> accidentally

... with a firearm he was cleaning. In his obituary it says he went back to the battlefield to retrieve said gun . Have you heard this story at all in your research . ?
I have not found any info on his early life or who he was married to at the time . It has been mention his friend was a Captain Grimes but i am afraid i know nothing of him ,
I am thinking out of the square and hoping to find the Grimes connection.
I am happy with any info you may have to point me in right direction . TY> Fred,