ANSWER: As long as your shoulders and chest has moved with laughter and people can tell that you are laughing, this invalidates your prayer.

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ANSWER: If you can see him, move as soon as he reaches the position he is moving to whether he says the takbeer or not. But if you can’t see him, You should follow him after he finishes the takbeer.

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ANSWER: Yes, you should as she is a human being and will intercede for you on the day of judgment to admit you to paradise. 

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