I know Jack and Maddie's relationship in canon is probably MEANT to be seen--depending on the episode--as a pretty bog-standard, 2000s-era "idiot big dad and exasperated, smart wife who puts up with him" trope.

BUT

my personal favorite interpretation is that BOTH are equally genius engineers who are also equally on the autistic spectrum, with a specific hyperfixation on ghosts and mad science.

The main difference is that Maddie has siblings and female social expectations, so she had to learn how to mask in ways that are seen as sociable and polite and attractive and "smart." When she does bumble major social cues (such as not recognizing Vlad's flirting until Danny points it out decades later, or humiliating her kids by showing up in a hazmat suit at school), it feels more "socially acceptable" from her.

She genuinely loves Jack because he could not care less about her being Feminine or Socially Acceptable. He just wants to shout with her about ghosts! So the nanosecond she's around him she can yank the mask off and go chasing spirits with a toaster turned into a machine gun.