[quote=@AnaSilan Sunja]
before I make my whole character, how long ago was the incident? Is it fresh enough that a character could have had a sibling in it, or heard stories about "Grandpa was killed by..."? 
[/quote]

My first draft was a generation or two ago but there is little chance they would still be angry with each other that long ago.  I'll make it be about 10 years ago.  Now updated in the OOC under "The Incident".