Is this a coincidence

so 2 years ago i made a facebook account for my cousin and he didnt want to share his birthday so i put a random one in it, and it was October 18th (some year), and a year later he had a new born sister who was born in October 18th, what could this mean or is it just a coincidence?

It could be a coincidence (or) It means you may have undiscovered psychic abilities..
You could be lucky, coz many people are longing for such powers or capabilities (including me). But, I guess people who are less interested in such powers are prone to obtain it..

If I were you, I would test my luck (I mean: I would confirm if am really psychic)..
Try guessing things before it happens.
Like, When your phone rings, try guessing the person calling before you answer.

If you seem to possess the power, don't be idle, try to read books on spirituality, meditate constantly. This will help amplify or help access your psychic powers much effectively..

By giving facebook a random generated birth date for a facebook profile, you gave them access to the owner's life, thus allowing them to create a family member of that birth date in an alternate universe while still maintaining the laws of relativity and time/space, which is explained by the law of facebook phenomena.

In lamen's terms...you influenced the birthdate of your cousin's sister.

Good Luck ;)

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It could mean you have a undeveloped physic ability

if i had to guess probably just a crazy coincidence

You are psychic =p