Arthur Weasley had always considered himself to be a good man, and a good father. He with his wife had raised six sons and a daughter and they had all turned out well. His eldest two sons were well respected in their fields of study and work, Bill a renowned curse breaker and Charlie a highly skilled Dragon Handler. His next son Percy had fancied a life of a more bureaucratic nature and had gone into the Ministry to work and was quite successful. His mischievous twins had set up their own business and were very successful. His youngest son and his daughter hadn't really chosen a direction for their life yet. They both wanted to play quiddich professionally but neither had be scouted for any of the British teams, they were currently working for the twins in their shop.
While his youngest two children had not had the success of their elder siblings they had been brought up like them to be a good law abiding wizard and witch. All his children had helped with the war effort in some way or another on the side of the light and Arthur felt that they were a good Wizarding family, one of the best if he was completely honest with himself. They were welcoming of pretty much anyone, muggle or magical and despite being poor and no longer holding the status his family once had he felt richer for it. So many in Wizarding Society shunned his family nowadays, but he felt that he would rather be shunned by some and be happy than rub shoulders with those of the upper echelons and be miserable.
When his grandfather had lost his place in the House of Wizards when he didn't disown his brother from the family for breaking his betrothal they had also lost the majority of the family funds. The family had to pay reparations for the broken betrothal to the Malfoy family which had nearly completely emptied the family vault in Gringotts, which had started the family feud between the Weasleys and the Malfoys. Arthur's father had been a teenager at the time and by time he had grown and Arthur was born he had become embittered towards the House of Wizards and the rules they lived by, as a result he shunned the House as they shunned his family.
Arthur grew up without learning the majority of the Wizarding traditions that the House favoured and had instead learnt a great deal about muggles, or enough to get him fascinated. He never bothered to learn how to navigate the nuances of society, instead taking a position in the Ministry that he was pretty much guaranteed as a Pureblood, even if his family had recently been labelled as Blood Traitors, after all no one really wanted to work in the Muggle Department anyway.
When he had married Molly and started to have children he had left their education to them, knowing that she had a more rounded Wizarding education. While she didn't practice their traditions anymore since she left her parents home she had still been raised aware of them unlike him. They had decided early on in their marriage that neither of them really held with society and didn't want to be part of the society life, not that they would have been able to anyway the Prewitt name no longer took Molly anywhere now that she had become a Weasley. They had agreed though, that the children while not raised with the traditions would be taught them all so that they could navigate that world if they had to or wanted to.
It wasn't until he saw the Daily Prophet that day that he realised that he had failed as a father in ways, he had never actually checked that Molly had been doing as they had agreed and been teaching their children what they needed to know. It was obvious to him, that Ginny wasn't aware of the social faux pas she had been a part of, he only just understood some of them and that was from working in the Ministry his whole adult lifetime. Ron seemed just as baffled by the situation, insisting that Harry and the papers were in the wrong.
While Ron was occupied in the bathroom and Molly was upstairs consoling Ginny Arthur questioned his older children about their own education. They had all admitted to not being taught much in the way of Wizarding traditions and knowledge from their mother, explaining that they were mostly self taught with the help of their friends from school.
He got up quickly and strode to the floo taking some powder and disappearing from the Burrow. He knew when he was over his head and needed help. Harry had left him to deal with his own family situation and to do that he needed the knowledge he himself didn't have of their world. After securing his accomplices help he returned home to await the evening paper to see the statement that Harry was going to publish.
The statement was a lot kinder to his family than it could have been and made Arthur even more resolved to sort out this situation. When his guest arrived after dinner he was glad that he had asked the elder boys to stay for the meal, the shock on their face was worth it. They all knew that he did not have the best of relationships with the woman and would never normally go to her for help with anything, but in this situation to keep it in the family he knew he had no option but to enlist the help of Muriel Prewitt.