Kitchen and Double Doors not sealing properly

[Dave30]

Hi

I got two doors in my parents house that are sealing diagonally.
They seal near the hinges then a gap starts to appear when it locks.

I thought about maybe removing the door and leveling and then screwing in the hinges but thought I would get some help first.
The doors are about 10 years+
Here are some pictures if this helps.

Kitchen Door:

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• Dave30
• 11 May 2013
• 1

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• Dave30
• 11 May 2013
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• Dave30
• 11 May 2013
• 1

Double Doors:

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• Dave30
• 11 May 2013
• 1

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• Dave30
• 11 May 2013
• 1

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• Dave30
• 11 May 2013
• 1

Any advice would be much appreciated

Thanks