So, to the person concerned about the old lady telling they seemed to be related... I noticed that in Kyuuta's memory with his parents photos the mother only showed a part of hear face, which looked pretty similar to the Riri, especially the hair style.
I don't want the author to play a trick on us with them being siblings, half-siblings or relatives at that matter. It'd suck,but still, I have all the other chapters to read.