I do indeed! Thank you for asking about it, Nonnie!

So the blurb at the top of ch21 is about Dweris, and it goes like this:

A reclusive, reticent and slightly obsessive Dwarrow, Dwerís was the daughter of Nerís, a scribe and poet, and Nár, the great friend and counsellor of Thrór King Under the Mountain. She was a huge-shouldered nonbinary Dwarrow who went by she/her pronouns. She was a mediocre smith but naturally talented with a sword, and through her skill and dedication she soon rose through the ranks in the Ereborean Army. She was justifiably proud of her skills, and practised approximately five hours every day with a variety of weapons. It soon became rumoured that Dwerís was unbeatable.

Challengers appeared, and Dwerís was obliged to see each of them beaten before she could return to her solitude and her beloved training. She had defeated ninety-nine opponents when a comfortable young nobleman, drunk and staggering, was pushed into the ring by his friends. Disgusted, Dwerís left. The noble later sought Dwerís out to apologise for his appalling state and for his friends’ actions, and Dwerís was struck by his sincerity and his way with words. She offered to train him, and so Dwerís was introduced to her future husband, Fundin son of Farin. She often said later that she had won her hundredth bout as well.

Dwerís was killed beside her husband at the battle of Azanulbizar, leaving behind her two sons Balin and Dwalin.

Of the two lads, Balin is the one who looks more like Fundin, and Dwalin is very much like his bulky-shouldered mum. Balin also has his father’s rather more pacific nature… though he has a LOT of his mum’s ferociousness as well, when pressed. Dwalin has something of his dad’s sly sense of humour: immensely sardonic and understated. 

Yet Balin preferred to seek out Dweris for comfort and advice, and Dwalin would go to his lawyerish, stolid, sensible father. 

Perhaps it was because the young Dwalin needed someone to talk to him about what it was that bothered him, to help him reason out the best course of action, to help him cool his hot head.

Perhaps it was because Balin, so incredibly clever even at a tender age, would likely already know what it was he had to do, and simply needed some silent, unconditional support as he gathered his courage to do it.