The so called bonemarrow storage does include an actual freezer or the sort that contains the donated bonemarrows, it is merely a database of people who are tested
-slimpiggy(瘦猪犹如插翅虎);
2002-1-6{238}(#324008@0)
His relative would have a higher chance of matching, but my understanding is that the percentage is no more than 25% higher than a total stranger.
It does cost money to get tested, though there are places that will sponsor such cause.