"Jean et Marie".
'John et Marie sont finis'
Marie Antoinette
Marie aide son frère.
You don't. That is not idiomatic. In French, you say "I call myself Marie." and you translate that as "Je m'appelle Marie."If you want to try to say that, you will have to come close to: "Zhe mahPEL MaHREE."
Il se marie
un baiser sur le pont Marie.
'John's house' is "la maison de John" in French.
Marie, Mère
Je suis à la maison de Marie.
"Jump Saint Mary" can be translated to French as "Sauter Sainte Marie."
In French, you would say, "J'ai une sœur qui s'appelle..." followed by her name. For example, if her name is Marie, you would say, "J'ai une sœur qui s'appelle Marie."
The name John in French is "Jean."