Ja, det verkar som om det skulle tillåtas.
Muggles som gifter sig med trollkarlar får lov att veta om trollkarlen. Seamus mor sa till sin far efter att ha gift sig.
“I’m half and half,’ said Seamus. ‘Me dad’s a Muggle. Mam didn’t tell him she was a witch ’til after they were married. Bit of a nasty shock for him.”
- Harry Potter and the Philosopher's Stone, Chapter 7 (The Sorting Hat)
Muggles som får veta om magi verkar tillåtas se den användas och interagera med magiska saker, eftersom Justin Finch-Fletchley hade sin Muggle-mor läser Lockharts böcker.
“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 …”
- Harry Potter and the Chamber of Secrets, Chapter 6 (Gilderoy Lockhart)
Lockharts böcker är uppenbarligen magiska, eftersom bilderna på honom på deras täcker rör sig, och innehållet skulle handla om magi.
“Written across it in fancy gold letters were the words: Gilderoy Lockhart’s Guide to Household Pests. There was a big photograph on the front of a very good-looking wizard with wavy blond hair and bright blue eyes. As always in the wizarding world, the photograph was moving; the wizard, who Harry supposed was Gilderoy Lockhart, kept winking cheekily up at them all.”
- Harry Potter and the Chamber of Secrets, Chapter 3 (The Burrow)
Grangersna, båda Muggles, blev tillåtna i Flourish and Blotts, en trollkarlbokhandel där det är troligt att de skulle bevittna magi.
“They each grabbed a copy of Break with a Banshee, and sneaked up the line to where the rest of the Weasleys were standing with Mr and Mrs Granger.”
- Harry Potter and the Chamber of Secrets, Chapter 4 (At Flourish and Blotts)
Eftersom de är tillåtna på platser uteslutande för trollkarlar, där andra skulle använda magi, är det nästan säkert att Muggle makar till trollkarlar får se deras make eller barn använda magi. Dursleysna bevittnar människor som använder magi flera gånger, inklusive trollkarlar som skulle känna till lagarna, liksom Mr. Weasley.
“Fred scrambled around, cramming them back into his pocket, then gave the Dursleys a cheery wave, stepped forward and walked right into the fire, saying, ‘The Burrow!’ Aunt Petunia gave a little shuddering gasp. There was a whooshing sound, and Fred vanished.
‘Right then, George,’ said Mr Weasley, ‘you and the trunk.’
Harry helped George carry the trunk forward into the flames, and turn it onto its end so that he could hold it better. Then, with a second whoosh, George had cried, ‘The Burrow!’ and vanished too.”
- Harry Potter and the Goblet of Fire, Chapter 4 (Back to the Burrow)
Dumbledore använder också magi framför Dursleys.
“Vernon Dursley had entered the room, Petunia at his shoulder and Dudley skulking behind them both.
‘Yes,’ said Dumbledore simply, ‘I shall.’ He drew his wand so rapidly that Harry barely saw it; with a casual flick, the sofa zoomed forwards and knocked the knees out from under all three of the Dursleys so that they collapsed upon it in a heap. Another flick of the wand and the sofa zoomed back to its original position.”
- Harry Potter and the Half-Blood Prince, Chapter 3 (Will and Won’t)
Även om han gör det för att roa sig själv, är det osannolikt att han skulle göra det om det faktiskt blev gjort olagligt av ministeriet.
“Harry looked round; all three of the Dursleys were cowering with their arms over their heads as their glasses bounced up and down on their skulls, the contents flying everywhere.
‘Oh, I’m so sorry,’ said Dumbledore politely, and he raised his wand again. All three glasses vanished. ‘But it would have been better manners to drink it, you know.”
- Harry Potter and the Half-Blood Prince, Chapter 3 (Will and Won’t)
Förmodligen, eftersom de alla fick göra magi framför Dursleys, verkar det inte finnas några restriktioner för att göra magi framför Muggles som får veta om det.