Tom and Charles Fowle were nearly family at this point in time to JA,Cassandra being engaged to Tom.

They were also long standing family friends. Thomas Fowle senior(also a clergyman) was a university friend and contemporary of George Austen; Fulwar Craven Fowle, his eldest son, was one of Geroge Austen's first set of pupils at the Steventon rectory (where he stayed with the family at a cost of £35 pa to cover the costs of tution,board and lodging).He became firm friends with James Austen.

According to Jane Austen : a Family Record by Deirdre le Faye, Jame admired the more dominant character displayed by Fulwar and dedicated this verse to him( one in which he imagines that their careers would take on highly divergent paths!)

An Epistle to Fulwar Craven Fowle Esqr.supposed Secretary of State in the reign of Geo. 4th by J. Austen as a country Curate
see p42

JA does refer rather more formally to others in her circle of acquaintances, particulalry to her friend Mrs Lefroy.