@Darklight99
It certainly doesn't appear that Gospel has the same ability as his father. At the very least he hasn't shown any ability to generate the poison, whereas he has shown an ability to withstand heat (but not generate it yet.) It's hard to say since he's just a baby, however humans have been analysing his blood so we'll eventually have a report on that. Perhaps the reason the CATT agent was interrogating Zeke was because he was already aware of the results of Gospel's blood test.
In any case, Gospel has inherited traits from both of his parents. From Zeke, his tail and wings. From Lorem, his horns, hair and eye colour. The colour of the scales on his tail appear to be linked to his hair colour. Also, he doesn't only have scales on his wings, he has a few white feathers (I might be wrong about that, and they were just scales). The claw on his wing is unique. Unlike Lorem (or maybe it's hidden under her feathers), he has a claw, but the claw he has is similar to his horn in shape, and so it doesn't have the saw shape that Zeke has.
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@Human_the_2nd
I would say that Merii and Lorem are certainly sisters. There's their body's shape, the shape of their horns, the shape of their tail and the shape of their wings (if you covered Merii's wings with feathers, they would look very much like Lorem's). They are both exceptionally powerful demons.
From other demons who are related, having similar horns is a dead giveaway of being blood related. I don't think we've seen any demons who weren't related who had the same horn, but if we did I would assume they shared a common ancestor.
They do have very different powers and we should assume that they inherited them from their parents from how Gospel has inherited his heat resistance from his mother, but there are demons born without abilities, without wings, and perhaps with new powers? Who knows? I certainly agree that Gospel could also have inherited his father's ability in some way.
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I figured some chapters ago that Zeke might decide to rejoin CATT to help Merii. It looks like his hand was somewhat forced in the matter due to these circumstances.
As always, they're quite cute together. Lorem wraps her tail around Zeke's here too.