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Neel,
I forgot to mention that donation centers may let a relative donate more often than a stranger could. The usual rules about how often you can donate are based on ensuring maximum safety for the donor, so those rules may make people wait longer than is absolutely necessary.
When it's your own relative (like your father) getting your blood or platelets then in the United States they let you decide whether to donate more often as long as you are healthy enough to do so.
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