My grandmother was a "mail order bride" when she married my grandfather. Her first husband was gunned down by her brother, who was angry that her husband had been named executor of their father's estate.
She spent her portion of the family fortune on Pinkerton detectives to hunt her brother down. Never found him. Think he died in Peru as a mining engineer.
Don't ever remember hearing her call him (grandfather) by his first name, only Mr. and the last name.
Sounds like an episode of "Dallas."