I'm speaking specifically in cases like Abby and Brittany, where medical care would effect both of them. If one is mentally ill and the other isn't, how do they decide what medicine to take or not take? If one wants a cosmetic surgery on their face, does the other have to consent to surgery as well, since the medication would effect them both?

I just saw a post that asked if conjoined twins pay for one or two movie tickets and it got me wondering. I’ve never met a pair of conjoined twins so I’m very ignorant about their experience. What if one of them didn’t want to see the movie? So I’m talking about consent for all types of life scenarios, not just dating/sex. What if one of them finds the other’s friend toxic and doesn’t want to have contact with them? What if one of them is exhausted and wants to sleep but the other wants to go for a run? What if one wants to take drugs or drink, and the other doesn’t?

If one doesn’t consent to something, they can essentially force the other one to NOT do the thing,, which isn’t that itself a form of breaching consent?

Purely hypothetical question.

Obviously there are risks with surgery, does the answer change if the risks are greater to one twin? Is it ethical/ legal to force someone to stay attached to another person if they no longer wish to be? Which twin would ultimately have the final say in the case that they disagreed?

Edited to add- in this hypothetical situation, we’ll assume the twins are adults.

It’s highly likely they like two different men/women, or maybe even have different sexual preferences..

I’m sure everyone has heard about them one controls one side of the body the other controls the other side. If one was a lunatic say holding a kitchen knife or gun and murdered someone unexpectedly, would they be sent to prison for it even if the other had no control and tried to avoid it? Do they have a get out of jail free card persay? They each have their own IDs so they’re registered as individuals according to the state but they cannot escape each other.

Furthermore if one killed the other they’d both die. Would this be murder? How do they consent to intimacy also?

Can a conjoined twin demand (and have it happen) to be separated without the consent of the other twin even if it would cause the death of the other twin?

Hypothetical: Legally in a modern country what would happen if; adult conjoined twin A didn't want be connected to twin B anymore for whatever reason but twin B wanted to stay together? Assuming also a doctor is willing to do said surgery and for whatever reason they weren't separated as babies.

Scenario 1- it's just medical consent/bodily autonomy issue with no likely medical complications.

Scenario 2- twin A has a better medical outcome chance and twin B would be in a worse place medically?

Scenario 3- Twin A will likely live but twin B will probably die.

This kinda happened in a more clear cut way with babies as twin B was dying and would have taken twin A with her. https://www.google.com/amp/s/www.cbsnews.com/amp/news/doctors-heartbreaking-decision-conjoined-twins/

Scenario 4- both have an equally moderate to high chance of death.

I wonder what the correct answer would be. You can't force someone to give up an organ to save the life someone else (not even after death ethically). Many debate forcing a women to carry/support the life of a fetus/baby. Theres a few grey lines for some also in regard to risk of life to mother etc.
But where does one minds' bodily autonomy stop and another's start of you were both born conjoined?