There were two firms in Huddersfield, stemming from Peter's initial foray in 1854 (initially with another partner), however brother James duly became a partner. This partnership was dissolved about 1879/1880, with a court case "Conacher v Conacher" well-covered in Musical Opinion & Trade Review at that time. James set up on his own, and in 1881 dismantled an 1860's Father Willis in Newport's Albert Hall and re-erected in the newly-completed Huddersfield Town Hall - and therein may lie the basis of the split, as Peter Conacher was by this time a Town Councillor and could not tender for the Town Hall project (which would undoubtedly been a worthy project to have bagged).
Herbert (son of James) worked with his Father before forming a partnership in the Birmingham area with P H Sheffield, sometime just before WWI I believe.
In terms of the "average-to-bad" epitaph, I simply don't recognise this in the number of Victorian instruments which I have encountered and worked on (by both brothers) constructed as they are with uniformly excellent materials, and most of them working with admirable efficiency in circumstances where the custodianship has been frugal. I accept that certain tonal characteristics of these instruments may not appeal to all.....