Dubliners: paralysis, gnomon, simony

On reading The Sisters, the opening essay of Dubliners, I was wondering why the sisters are in the title; as the narrative is spun around the uneven friendship between a young boy (the narrator) and his peculiar attraction towards Father Flynn, a old paralyzed man sitting in the backroom of an "unassuming shop, registered under the vague name of Drapery", selling children's bootees and umbrellas". Father Flynn was sharing pieces of pious wisdom with the child, in the form of complex and mysterious riddles. His earthly pleasures were snuff (brought by the child as a present from his aunt) and beef tea (made by one of his two sisters, who must have been in charge of the Drapery shop). The boy is visiting the house of mourning with his aunt. Our narrator, the child is an observant, silent listener in the world of elderly people, afraid to accept a cream cracker because of the noise, but accepting a glass of sherry. What we learn about this old priest seem to have unspoken pointers to an attraction to young boys, or perhaps this is so easy for me to spot because of todays' scandalous revealing of the overwhealming evidence of pederasts in the catholic church. This is how I read this story, in 2010. On one hand, the young boy has felt a sort of mystified-intellectual attraction, on the other hand he is now piecing together indirect messages about a disappointed person, "they said it was the boy's fault" and "something gone wrong with him". And, the sisters? They have a shared childhood in Irishtown, apparently they never married as there is no mention of other family relations, (they may even have been Catholic nuns for a while, and were probably also marked by the peculiarity of their brother, the venerable priest and his unspoken attraction towards ...whatever. Also, in the first pasages, we learn that this young child is struggling with odd terms such as "paralysis, gnomon and simony". According to Tindall's a Reader's Guide to J.J, Dubliners is not as simple as it may seem; the paralysis theme relates to Dublin as city - but he also warns against overly complex interpretations