Everyone in the house is training the dog

A dog does not learn household rules. A dog learns one set of rules per person, because that is what the evidence supports.

If the dog jumps and one person knees them off, one person says no and turns away, and one person crouches down and says hello, the dog has not learned anything inconsistent. The dog has learned three accurate things about three people.

Why this is not a nagging problem

The usual advice is that everybody has to be consistent, and it is true and it is useless, because the reason people are inconsistent is not that nobody told them.

It is that the rules were never actually agreed, only announced by whoever cares most. Someone in the house did not sign up for this, thinks it is excessive, or genuinely enjoys the thing the rule forbids.

You cannot get consistency by asking for compliance. You get it by agreeing a smaller set of rules that everybody will actually keep.

The practical version

Pick three rules. Three. Not a laminated list on the fridge.

Whatever the three are matters less than that everyone in the house will hold them without resentment. Three held rules beat eleven announced ones every time.

Everything else is per person and that is fine. If one person wants the dog on the sofa and one does not, the dog can learn sofa with this person and not with that one. Dogs are very good at that. They are much better at it than at rules that change randomly with the same person.

The person who was not consulted

Often a partner who did not want the dog, or wanted a different dog, or is doing more of the work than they agreed to.

No training plan survives that, and the plan is not the thing to fix. I have watched a lot of training fail for reasons that were entirely about the humans, and the dog gets described as difficult in the retelling.

It is worth naming out loud before anybody spends money.

Children

Children cannot be consistent. That is not a criticism of children, it is a description of them.

So do not build a plan that requires it. Use gates and structure instead. Children and dog together in supervised blocks, separated otherwise. Give the children one job that they can actually do, usually something like putting food down or being the one who gets to release the dog from a settle.

A child with one clear job does it well. A child asked to enforce eleven rules does none of them and gets told off for it.

The one to get everybody on

If you only align on one thing, make it the greeting.

It is the highest frequency, highest arousal, most repeated interaction in the household, and it is the one most likely to escalate into something worse. A house where every person does the same thing at the door will see changes across a lot of other behaviours without touching them directly.