@Remembermynamealways Again, likely narcissist rather than psychopath or a mix, I don't know.
Mine had a life goal of wanting them that was something made clear from the start. This was fine for me as I wanted children too, however they wanted them as soon as possible rather than getting financially secure. We did after a while of trying, which of course was my fault it didn't happen sooner but it was still fast.
The first, no true bond whatsoever right away and I raised them the whole way. Said they loved them, cared for them but said they don't have a bond. Second, totally different and was inseparable and still is now but it's to the point of obsession.
They are treated differently, one is getting a raw experience of the world full of truth, things should not know yet and has a lot of rules and responsibilities. Very much like me, empathic. Other, treated like a prince and can do no wrong and do whatever wants to and nobody else is allowed to care for them. Lovely and sweet but not so empathetic.
In general they are possessions, extensions of them almost and it's again control. They are social tools more than anything, totally different parenting style in public than at home. At home leave them to own devices, while they do what they want to do.
I found they prefer babies and toddlers and I believe this is because they are controllable without own opinions. The attention is higher at those ages from others too. As they get older more hassle, a voice of their own. However, a crying baby or screaming baby doesn't have the same response as most, it's rage inducing rather than say, worry.
Alongside this they hate other children with a passion, specifically preteen and teenagers except those who have some form of issue like themselves that make them broken or need their pity. The care is false though because it makes them look better by showing 'care' to these and everyone around thinks, oh how good they are. If only they knew.
Mine can be extremely horrible and blunt with one of mine. Not to the lengths you have experienced but I'm not there now so I have no idea and I'm worried about that. It is very much akin to treating them like a slave or animal at times.