Welcome aboard me hearty, Anyway it is lovely that you got a razor from a relative and that it is part of your family's history, if it was me i would get it honed by a "Honemeister" from here and you can do that by going to HERE and following the instructions on the website, then you will send it to Lynn from this very forum, it should come back ready to use, otherwise if you learn how to do it yourself you could do more damage to the straight than good, also i would only use it on special occasions like Xmas, Birthday etc.. Becuase it would be nice to hand that down to your grandson in time to come. By that way that advice on this forum is top notch, i have attached some of my Shaving Links to get you started just have a look around
MY BOOKMARKS DOWNLOAD HERE