How is it useful for a Muggle to have a trained wizard or witch in their family?

“My name was down for Eton, you know, I can’t tell you how glad I am I came here instead. Of course, mother was slightly disappointed, but since I made her read Lockhart’s books I think she’s begun to see how useful it’ll be to have a fully trained wizard in the family…” – Justin Finch-Fletchley in “Harry Potter and the Chamber of Secrets”

For one thing, witches and wizards aren’t supposed to use magic around Muggles:

“Any magical activity which risks notice by members of the non-magical community (Muggles) is a serious offence, under section 13 of the International Confederation of Warlocks’ Statute of Secrecy” – Harry’s warning letter from the Ministry of Magic in “Harry Potter and the Chamber of Secrets”

I’m sure there are some exceptions if you’re a Muggleborn and you’re over 17 years old and are legally allowed to use magic? Does the rule still apply if it’s your own family and they know you’re a witch or wizard?

If the Muggleborn makes lots of money working in the wizarding world, they must be able to convert it into Muggle money and use it to pay for things their family needs?

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I feel sorry for Sirius.

On the night when Voldemort kills Lily and James, Sirius goes to check on Wormtail as he’s the Secret Keeper but discovers he’s not there and has told Voldemort where they’re hiding.

Sirius turns up at the Potters’ ruined home and Hagrid is there picking up baby Harry from the rubble. Sirius tells Hagrid to give Harry to him as he’s his godfather but Hagrid tells him that Dumbledore ordered him to take Harry to live with the Dursleys.

Did Dumbledore ignore James and Lily’s wishes by ignoring the fact that Sirius is Harry’s godfather who was the Potters’ choice as they wanted him to look after Harry if something happened to them?

Sirius had lost two of his best friends and it was his fault for persuading Wormtail to switch places with him as the Potters’ Secret Keeper, so maybe he was trying to atone for his error by trying to look after Harry.

Sirius had also lost Wormtail as a friend because he betrayed the Potters and brought about their deaths.

Dumbledore knew he was giving Harry to a family of muggles who would never understand him, and he must have known that Lily and Petunia didn’t get on, especially after he wrote to Petunia and said she couldn’t go to Hogwarts and she clearly held a grudge about that.

Sirius might have brought Harry up properly, making sure he knew how great his parents were.

“Writin’ lines! What good’s that to anyone? Yeh’ll do summat useful or yeh’ll get out. If yeh think yer father’d rather you were expelled, then get back off ter the castle an’ pack. Go on!” – Hagrid laying down some truths about life at Hogwarts to Malfoy (Harry Potter and the Philosopher’s Stone).

Several books later….

“Now, you are going to be doing some lines for me, Mr Potter. No, not with your quill,” she added, as Harry bent down to open his bag. “You’re going to be using a rather special one of mine. Here you are”. – Umbridge trying to punish Harry in her own special way (Harry Potter and the Order of the Phoenix).