Been re-reading some stuff on the First Scottish War of Independence and this thought occurred to me, say Robert the Bruce died in the period between 1306 and 1308, what would happen to his widow Elizabeth de Burgh? If he dies before she is captured, would one of Bruces brothers seek to marry her himself, or simply use her to gain leverage over her father?
Well, IOTL she was imprisoned from 1306 to 1314 in different locations. As for her father, Richard de Burgh, his first loyalty was always to the English crown. He had been friends with Edward I, had led forces from Ireland during Edward I's Scottish campaigns, and when Edward Bruce invaded Ireland in 1315, Richard fought him, and by extension, his son-in-law. To be honest, I'm not sure what the political rational between the marriage of Robert Bruce with Elizabeth de Burgh was. Maybe there was none. If they genuinely loved each other, good for them.
As for one of Robert's brothers marrying her, it would only be possible if the POD was Robert dying at the Battle of Methven. Even then, I'm sure such a marriage would have been against church law. At least, that was (partly) the response I got when asked about the possibility of Edward I of England marrying Yolanda of Dreux, his former brother-in-law's second wife.