Till you've been among them some time and understand them, you can't think but that they are quarrelling.

Not a bit of it.

They love and respect one another ten times the more after a good set family arguing bout, and go back, one to his curacy, another to his chambers, and another to his regiment, freshened for work, and more than ever convinced that the Browns are the height of company.
This family training, too, combined with their turn for combativeness, makes them eminently quixotic.

They can't let anything alone which they think going wrong.

They must speak their mind about it, annoying all easy-going folk, and spend their time and money in having a tinker at it, however hopeless the job.