Note: This story is totally AU! I wanted to involve two of my favorite Maggie characters so I made them sisters! Both of Minerva's parents are Catholic Muggles. As cool as I think it is that Minerva's dad was a Protestant minister, according to Wickia (because my dad is too). Minerva is Muggle born in this story.
It was a cold December day in Glasgow, and the McGonagall family had just left mass and was ready for a meal of Smoked Salmon. Isobel and her daughters Mary and Margret began to scurry around the kitchen singing O Sanctissima. Minerva was sick of her Muggle mother's love of Marian Hymns, besides, she had an announcement to make.
"Mum, Dad, everybody, as I told you in my letter, I have some important news."
"Mary and I have news as well", declared Margret.
"What is this news, girls? "asked their father Robert.
"Mary and I feel we have been called to join orders in America."
"And I have secured a teaching position at Hogwarts", declared Minerva.
"Congratulations, but does this mean you will leave the non-magical world forever?", asked Isobel.
"I will still visit."
"Good! Girls, America is so far away!"
"Mother, we really love these religious communities", declared Margret.
"Isobel, aren't you proud that your daughters have been called to be sisters?, congratulations to you as well, Minerva."
"Thank you, father", at least someone in her family acknowledged her magic positively.
"I'm proud of you all, and wish you all the best of luck" Isobel declared.
"Thank you" said the young ladies in unison.
"I start at Hogwarts, Monday."
I'll be leaving for San Francisco, Monday", said Mary.
"I will be leaving for Massachusets on Friday", said Margret.
Massachusets! I shall check on her when I go to the Salem Witches Institute, thought Minerva. If all went well, soon her sister's convent would be familiar with a grey cat, who would visit in the summer.
"I shall miss you all. Minerva, what shall I tell everyone about your absence?"
"That I have joined a cloistered convent and wish to have no visitors besides family."
"That sounds very logical Minerva. You are a bright young lady."
"Thank you father!"
"Oh girls, I shall miss you all and will pray for you every day" exclaimed Isobel.
All three of the girls were grateful to hear that. Minerva still considered herself a Catholic and considered the Devil and demons equivalent with Dark Wizards. She loved her family very much and would continue check in on them in her Animagus form.
"I will pray for you as well." Offered Minerva
"We all will. As a cloistered nun I shall pray all the time. What will you be doing Margret? "asked Mary.
"Working with mentaly retarded people. I truly believe the Christian institutions are better than those horrid state institutions, but wish the place I'm going wouldn't have the name feebleminded in it. It's such an ugly term. I will show them Christ's love and continue to make St. Joseph's Home for the Feebleminded as homey as possible."
"How kind of you, but it sounds so challenging", said Minerva.
"Who said being a Christian was easy?"
"True, dear."
Latter that evening the Family said the Rosary together and Robert recited an Irish Blessing.
May the road rise up to meet you.
May the wind always be at your back.
May the sun shine warm upon your face,
and rains fall soft upon your fields.
And until we meet again,
May God hold you in the palm of His hand.
They all hoped and prayed for blessings.