This half-foot. Dandan.

Looks preety similar to this lady here (I'll put them together so you see):

Half-lidded eyes, black hair&eyes, small eyebrows, curly hair... Dandan's skin is lighter probably because of low sun exposure (dungeon), and he has tons of freckles because he preety.

This two are clearly relatives if not siblings.

Flertom is a mirror image of the lady up there. She got Chil's eyes. She even has almost the same haircut (a bit longer). She's clearly the mother. We've solved Chilchuck's wife mystery.

But this wasn't what I was going to say.

This implies that Wife and Dandan both knew Chilchuck since their childhood. Because there's no way that Chil was just friend of the sister. They're both close to the same age, and I'll say Dandan is a Younger sibiling (she gives big sis vibes, and he gives young bro vibes). So either she introduced him to her brother or he introduced him to his sister and they became best friends as kids.

Could you imagine how their relationship was after Chil's Wife left him?

He knows he has to say something, but he doesn't want to end his relationships. At the end he takes his sister's side. He distances a bit from Chilchuck, calling him an "aquitance" rather than a friend. It isn't that he hates him, is just that it's complicated. And they both know it. They're in good terms tho, they just aren't best friends anymore and they don't talk about it. Their worry is the guild, not their personal stuff.

That's why Dandan introduces Chilchuck to Laios. If they were in bad terms, he would've suggested any other half-foot. They both priorize the guild and general safety of their own race. That's why Dandan suggests Chil instead of a less experienced hafling. He cares about the union and respects Chil's time and experience in dungeons. They're on good terms, at least good enough. Summing up, I get the feeling Dandan doesn't particularly likes Chil after what happened with his sister, but he respects him at least.

Gotta give my two cents

I have been a Jonsa shipper since I don't remember when, but I have. From the start of the show, we were shown incest between the Lannisters and occasionally Targaryens, and made to hate it. We would see Cersei and Jamie and go "Ew". Then, we would see Viserys and DanDan and again "Ew". Despite incest being a common practice in Targaryens, we were still uncomfortable with Viserys touching his sister. So, we were already supposed to oppose it. Then, we have the image of Starks: Honor, Loyalty, Unity. They were shown to be as clean as they could come. Siblings loving each other like normal siblings. Us viewers already picked our sides. If it's the Starks, it's good. If lannister, it is bad. Over time, the show has made all houses transition from black and white to grey. I think House Stark's final step into the grey area would be the "incest" between Sansa and Jon. They were raised as siblings, but them marrying and rebuilding the Stark line would normalize the white outlier that House Stark has been so far. Everyone associates goodness with them, even though no other house has had that privilege. Game of Thrones loves to show us that no one is all good or bad. Jonsa would be the blemish on House Stark as everyone has known them to be siblings and Jon, looking like he's looking, would always seem more Stark than Targaryen. Many people would still find it difficult to swallow the truth but eventually they'll have to accept it. Oh and I do think DanDan might be pregnant. Jon always likes to say that he would never father any bastards but he will father a bastard. Dan will die and Sansa would raise this baby. History would repeat itself but the circumstances will be different. Sansa will treat a real bastard of her husband's with love that Catelyn refused to do to a "bastard" of her husband's. Jon might feel uncomfortable putting this responsibility on his wife but Sansa's reaction would make him feel easy about the circumstances.