Ok I am confused.
In Chapter 4, it was mentioned that Humans can't have children with women of other races.
So, how did the Shopkeeper in this chapter mistake that they were there to buy clothes for a child, and those two were married? (even if we consider it as business flattering)
I mean, a key aspect of marriage is always to continue the bloodline, and if you know you can't have kids, why would any marry someone? (especially in such an old era setting)
This point was also heavily focused in the Anime adaptation with how MC was shown to have had sex with a Human Woman from the first village and years later when he returns, he finds that Woman had given birth to a child, and the Anime heavily hints that the child might be MC's.