Not sure what you mean by 'is there any system'.
If you have some basic info about your family, it should be possible to determine whether he is related by using public records. Unless someone else has already researched him and will share their findings? If you are new to family history research, I can recommend some books to get you started!!!
Now i don't know anything about his family background or anything like that but i do know that he was Archibald Gracie's bed room steward for the journey, just an interesting fact i thought i'd tell you