To be fair, it doesn't make much sense to mention them unless they're from that relationship

Possibly. I just mentioned that in reply to a seemingly strong logical conclusion that "it must be" twins. Human communication patterns are not very precise and yet we often tend to jump to conclusions.

Controversial.

You know step-parents do exist that actually have a good relationship with their step-children and treat them as their own biological kids?

That's called operating an additional processing unit. You use AWS to quickly bootstrap a company, why not bootstrap a family? After all, genes can change a bit of the temperament of a person, but in the end, it's all about education and training. The ultimate father is the one who has risen the child, not the one who made the hardware. (Or Luke would have chosen the dark side.)

Most estimates for life outcome are ~50% genetics, 5-15% parental/teacher influence and the rest unknown.