Yeah, I skipped over a comic about Niels and his eyepatch because there was nothing to do with it other than pirate jokes, and pirate jokes were never really that funny to me.
Anyway, "nisdad" is Kiddo's word for Niels.
Niels been in a relationship with Natalie and Duncan even before Kiddo was conceived (Yes, Duncan is the dad), so when Kiddo was learning to speak he was kinda confused and kept calling both Duncan and Niels "dad" until one day Natalie said "Niels is your other dad" and Kiddo sort of just smashed the words together to "nisdad".
And in case you have no idea what Niels is talking about, people who lose an eye get a temporary fake eye until they can get a proper acrylic eye (they rarely use glass any longer) so the eye socket won't collaps.
The scars won't be permanent either. Niels is far too vain not to get them removed.
EDIT: Natalie isn't pregnant. That's just her crazy hips.