I don't think the other sins are dumb enough to fall for that except for maybe Mammon.

Lol I think the same.

I think the sins would be more than happy to meet their niece's girlfriend.

I don’t think the sins would fall for it either, but if they did, I’m pretty sure Stolas or someone else would notice (I said stolas cuz this is based on the trial episode)

The only person that can take Lucifer's place is Charlie or Lilith

Still there's no way five of the other six sins would fall for that.