This is in near-equal parts deep, depressing, and hilarious..
I feel for Dad's lack of concern, since this reincarnation of his wife is indeed a literal miracle for him. It must be heartbreaking to hear your own husband say that they "already lost you" - even if it's "once, a decade ago". You yourself died in the most literal sense, a permanent and painful conclusion in your relationship with the entire family... but somehow you're back. It's possible that one of your loved ones, especially your special other (i.e. Dad), may turn inseparable. It's one side of dealing with a reversal of death, different from what Mom may feel by "returning back to life".
But yeah, existential thoughts and newfound inseparability aside.. you can't simply announce that you're wed to a little kid without raising suspicion, or inviting a kick to your front door lmao. And what do Mom's current parents know about this series of events? I just hope we see what's up with all of their world throughout this series 🍜✨