#Or if you're into crossovers the fiance could be someone with powers from another series

[madametamma]

Danny accidentally changes from ghost to human form in front of his parents eyes.  They say nothing but share a pained, shocked look before Danny flies off, never to be seen or heard from by Jack or Maddie again,

until ten years later.

A mysterious person shows up at Jack and Maddie’s door.  They claim to be Danny’s fiance and wanted to personally track down the parents to meet them and invite them to the wedding. Danny never told them why he hasn’t seen his parents in years.  He rarely speaks about them, but one evening Danny confessed that he wished they could be there for the wedding. So out of love they track down Fentons with plans of bringing them to the wedding to surprise Danny.

Jack and Maddie are floored by this news but accept the invitation, believing that this might be their only chance to reconnect with their long lost son.  They’ve waited for this moment and thought about what they wanted to tell their boy for so long.  They can’t blow this.

However they are a bit taken aback by Danny’s fiance and their family who are not as human as they initially appeared.  Turns out after Danny left, he had no where to go but to lean into the ghostly community for support.