It's about Thomas Arrowsmith and Simon Arrowsmith "his n[atu]ral[l] and law[fu]ll Broth[e]r a Minor". (I think that's right - it's from lines 3-4 at the top, but it's a bit small.)
The arrangement behind this is a bond for Tuition and Curation, and he describes himself as Tutor and Curator. These are often set up in a will or by an administration to look after children before they come of age, so a likely scenario is that their father had died and Thomas was taking on responsibility for his younger brother Simon, and here he was giving an account of his dealings to the executor or administrator.
There may be other probate or administration documents connected with this, but in the meantime, do you need a full transcription? (Other readers - please feel free to provide this, as I'll be away from my computer for a bit.)
