Hi, I was wondering if you could answer a question I had about how much authority a lord has over his extended family members. Like if a lord wants to marry off one of his brother’s daughters, can he do so even if his brother refuses to agree? Who holds the most authority in a situation like that? Does it change depending on the status of the lord in question- like if he was a king, lord paramount or someone from a great house rather than a more typical lord?
Again re feudalism, a lord has as much authority as his vassals allow him, and vassals include family members. (And "allow" includes what they feel they must do per traditions and societal pressures.) Look at how Hoster Tully tried to marry off his brother Brynden to Bethany Redwyne. Brynden refused, and though this pissed off Hoster and strained his relationship with his brother, that's how he left it. A more cruel lord, who loved his brother less and his status more, might use more pressure to get his way. Lords are not bound by any law or custom to support their family members, so in the case you mention, that lord might then tell his brother "fine, then, you and your daughters have to leave". And faced with having to make his own way in the world while supporting his girls, the brother might bow his head and submit. Or maybe he would decide to be a hedge knight after all, or maybe he'd have in-laws he could look to for support, it all depends.
Though again re feudalism (because the feudal contract goes both ways), theoretically this brother could try to go over his lord brother's head and appeal to their overlord. See for example Lord Wyman Webber, who when faced with a daughter, Rohanne, who refused to marry per his command, instead wrote a will that said she had to marry within two years of his death or the lordship and the castle of Coldmoat would go to her cousin instead. It was asked within the story, couldn't Lady Rohanne appeal to her overlord, Lord Rowan, and have him override the will? Well, she tried, but that Webber cousin just happened to be married to Lord Rowan's sister, and so he upheld the will. But maybe in a different situation something could be done -- perhaps the overlord is known to be particularly noble, or perhaps this pressured brother has a connection to the overlord (maybe via his wife, maybe they were companions in battle or as squires). But still, the brother would have to take his daughter with him during this appeal, or he might return to find out she's been married off in his absence.
And as for the girl herself, could she not refuse? Even if she's underage, isn't it true, as Sansa thinks, "Not even the High Septon himself could declare a woman married if she refused to say the vows"? Well, we have Sansa's own example, where when she was faced with marrying Tyrion, Cersei told her she could be dragged to the altar and make a spectacle to be laughed at but they'd still make her do it anyway... and so Sansa submitted and said the vows. See also how Randyll Tarly forced his son Sam to join the Night's Watch. Sam didn't have to submit, there is no law saying he had to obey, but his father threatened to kill him if he didn't, and due to Sam's experience with his father's abuse (and what that abuse did to his personality), he fully believed him. Someone once asked me if an overlord could help there (though weirdly they mentioned Stannis, who wouldn't be able to do anything even if he wanted to), and the point I had to explain was that Sam was so beaten down by the abuse he never would have even considered going over his father's head, even if he could have somehow escaped his father's guards on the way north.
So with these examples, you can see where the status of the lord in question may change things -- a king, for example, has no overlords to appeal to. A lord paramount's brother could only appeal to the king. This status also changes what pressure the lord can bring to bear -- a very small lord may only have a sworn sword to threaten his brother with, a bigger lord could have a whole garrison, and the king would have not just the Kingsguard and the castle guard and the city guard but theoretically every lord and soldier in the country to use as pressure. Again, feudalism works both ways.
And generally none of this is even stated aloud. Everybody just knows the answer to "you and what army?" and so even family members understand what their lord pressuring them means. (Girls particularly innately understand this, along with patriarchal pressure; like Roslin Frey had no real choice at the Red Wedding but to obey her father, brothers, uncles, and cousins.) So, like so many things in ASOIAF's medieval-inspired era, the personal is the political. Only the personalities of the people involved, and their means of pressure or access routes to escape, are what truly defines what can happen in cases like this.









