What is this pink flower? I would like to know what is this flower. It's be growing...

I would like to know what is this flower. It's be growing in our house for over twenty years. I only just have to separate its roots which are bulbs, similar to onions, and put them into new pots or flower bed and they keep growing. The leaves which are close to grass blades keep growing even except watered a whole lot but the flowers one and only grow if they are generously watered, what could they be? Does anyone know the describe of these flowers?
1 hour ago - 3 days left to answer.
Hope the picture surrounded by my Avatar helps. They are pink within colour and have 6 petals respectively.
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Answers:    Sounds like you hold rain lilies, or zephranthes. Go to www.plantsdelight.com and look at their online catalog. They enjoy many within several colors.
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