siryn's mother getting murdered at her birth, getting kidnapped by her villain uncle tom and coerced into being his sidekick before he eventually realises she doesn't want to be a villain and sends her off to boarding school, then years after, the x-men help theresa with her father sean cassidy, with banshee apparently never knowing he had a daughter because he left for work right after his honeymoon with his wife and terry's mom maeve rourke (and again, jessica drew is once again at the reunion of siryn and banshee omg)

the beaubiers' parents dying in a car accident and then the twins getting separated, jean-paul getting adopted by their relatives the martins and jeanne-marie being sent off to a boarding school because the martins can't afford to raise two kids and they choose the boy, only for the martins to then also die in a car crash when the twins are six, and northstar and aurora effectively are separated into different lives for many years until they reunite at alpha flight, when sports celebrity northstar is noticed by department h and logan howlett recommends to aurora that she should go to department h

“Charles? I beg y’r pardon, Miss. I was looking f’r Professor Xavier. I’m Sean Cassidy. Can I help ye?”

“I’m Theresa Rourke. Your cousin Tom asked me to give ye this. It’ll explain who I am... and why I’m here.”

“Theresa, d’ye know what this says?”

“I do... father.”

BLACK TOM CASSIDY is a rogue — he and Sean are old bitter foes — yet Banshee never doubts the truth of what he reads. He’d married young, for love, and they’d a glorious honeymoon together before duty summoned him away. When he returned, Maeve Rourke Cassidy was dead. Standing over his wife’s grave, Sean thought his heart would crack with grief. Now, facing the daughter he never knew he had... he wonders if it will break with joy.

Nearby, Professor Xavier has been telepathically eavesdropping on the scene. As he tactfully breaks contact, his smile tells the X-Men — and their guest, Spider-Woman — that the reunion is all they hoped it would be.

them showing up on the masked singer, either as a duo or separately

Theresa Cassidy