ronigafniThank you so much for your response. It was so helpful and illustrated to me why I need to review the classes I have already seen and finish the course itself. Just seeing the formulations make it so much clearer and remind me of the necessity (whenever possible) to do so. My email address is rgafni7@gmail.com and I would be thrilled to get a copy.
I constructed a new argument of some of the issues, I think it is valid:
Premise 1: If I own x, I can defend my ownership of x against all aggressors
Premise 2: Trespassers are aggressors
Premise 3: Those using my property without my explicit permission are aggressors
Premise 4: My body is my property
Premise 5: A fetus is trespassing my body and using it to sustain itself without my explicit permission
Premise 6: A newborn child still attached to the umbilical chord is using my body to sustain itself without my explicit permission
Premise 7: A parasitic twin is using my body to sustain itself without my explicit permission
Conclusion: It is morally acceptable to abort parasitic twins, fetuses and newborns still attached to the umbilical chord on the grounds that they are trespassing on and/or living off my body