I've always heard that close friends and sisters and moms attain their periods around the same time, how is this possible?

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Answers:    Everyone's bodies present out chemical signals called pheromones. When you share living space with other women you period start getting in sync due to the influence of these chemical signals you and others are giving off. You can't smell them, but your brain is picking them up..

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Women's hormones affect when their spell will come/when they will ovulate, etc. and eventually their hormones will just be in sync so that they are on like cycle. its not possible.

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Yeah it's all hormonal.

I remember at institution there was similar to 10 of us on at once, man was there a great deal of tension that week :D

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