No, there are no rules when it comes to appearance. It's a genetic lottery. The boy can look like his mother or paternal grandmother etc.
The Baby Would Be Type A Blood
Yes the baby would be b or o.
If you're asking who the baby is to the one who gave birth to it, the baby is the child of the half sister, making her the baby's mother. As for the stepfather, he would be the child's father and step grandfather. But if he and the half sister's mother divorce, then he would no longer be the child's step grandfather. But he would, of course, still be the baby's father.
because half the baby's genes come from the father.
Your baby would have brown eyes.
The father would be either AB or AA.
# Probably because he got bored with you.
The baby could be either A or B depending on what the father donates with his sperm.
their name would be a feminized form of the name of their father
Legit itself means truthful, therefore, a legit status would be a truthful status.
If it was a boy then he would be your sons half brother and if it was a girl she would be your sons half sister.
I honestly don't think that would matter. That would not make a difference, but if it was the mother smoking during the pregnancy it would certainly affect the baby. Not during conception though. The father only shares the sperm, not blood. There's no way it would affect the baby.