Is It a Sin to Remove Someone from Life Support?

Questions about whether it’s a sin to remove someone from life support, whether it would be morally wrong to attend a legal assisted suicide of an unbelieving loved one, and what to say to a pregnant Christian who is justifying choosing abortion by saying God’s grace will cover it. Is it a sin to remove someone from life support who has been declared clinically dead and has lost brain function? Would it be morally wrong to attend a legal assisted suicide of an unbelieving loved one? How would you recommend handling a situation where a pregnant Christian is justifying choosing abortion by saying God’s grace will cover it?