When you speak of bloodlines and blessings, it is not possible to follow the details of interconnections across generations with any amount of accuracy. Even Joseph Smith, while certain of the remnant's existence and importance, was not certain of their identity. They needed to be found. Although some groups showed promise, they were not, and have not, been identified.
There were rumors of a people in the southwest, who made rugs, that may be the group.
There are those who are convinced the Hopi are the people. Hugh Nibley has spent time with the Hopi and written a great deal about them. He seemed satisfied they were likely the chosen remnant. He studied their year-end dance festivals and believed they contained elements of sacred narrative identifiable with the Gospel of Jesus Christ. I have LDS friends who have spent time among the Hopi who have the same view.
I do not believe it is necessary to identify who the remnant is. It is important to realize there is a prophetic destiny of a remnant, and to have a little humility about the limited gentile success which has been prophesied. But to go further than that is not always wise.
Everything in the Lord's plan is timed. You cannot change the timing. If, for example, you hurry to get where you think Zion will be established, and arrive before the burning and cleansing of that land, then you may have found the right spot, but you arrived at the wrong time. You will be killed, burned off the land as it is purged and prepared. The Lord alone controls timing. And timing is as important as any other portion of the Lord's plan.
Also, to identify the remnant beforehand is ill- advised. They will be identified in the ordinary course of events. They will fulfill their prophetic destiny. As it unfolds, it will be natural, appropriate and in accordance with the hand of God. There will be no need to force Zion.
Those who are the remnant may well be Hopi. Or, they may come from Hopi blood, if that is indeed the remnant bloodline. But during the time between the closing of the Book of Mormon history and the opening of American history, how many from that bloodline departed or were captured and carried away to another place. If only one left and migrated into Canada, later to intermarry and leave descendants, who have now intermarried and live in Alberta, Montana and Idaho, then they may have long ago lost any identity with the Hopi. But they may still be heirs according to the bloodline that is theirs.
How do we know the remnant does not now include businessmen in Mexico City, families in Peru, a physician in San Francisco, or a housewife in Florida, all of whom have the blood of the remnant within them, but they are without any knowledge of it? Nor can we know if there were intermarriages and migrations which make northern Mexico and Arizona filled with people who are the remnant, heirs of the promises, and destined to one day return to the faith of Christ. Who knows but what the in-migration of those regarded as "illegal aliens" currently inside the United States are not in possession of the blood that qualifies them as heirs of the promises.
They exist. They are known to the Lord. There may be great areas and people, as well as disbursed and assimilated individuals who are among those who are heirs. It is not important to "find" them in one sense, but critical that they be found in another. They will self-identify. That is, those in whom the promises will be fulfilled will act consistent with the promises. They will become known as they engage in the prophesied conduct. They will convert. They will become reunited through the Gospel of Jesus Christ. They will shake off the dust of history, arise and become glorious. They will blossom as a rose and build the New Jerusalem. We will not control that. It will be them awakening, not us attempting to assimilate them into our culture and society. The Indian Placement Program didn't work because it was not the means by which they are to be found. Pushing our culture on them will only create errors their return is intended to cure. And so the timing and means are critical for this to unfold in accordance with the Lord's plan.
If you were to know for certain exactly who was to fulfill the prophecies, and to visit with them today, you may be profoundly disappointed. Until the time is right, they won't be ready either. They will awaken on time. But until that time, you cannot rouse from slumber those who are not ready to awaken. That it WILL happen is certain. But the time is as important as any other component of the event.
Do the remnant people even know they are the Lord's and heirs of promises in the Book of Mormon? Probably not. They, the remnant, are to learn of these things from the gentiles. (2 Nephi 30: 3.) Therefore it is unlikely they will know anything about it until the record of the Book of Mormon is delivered to them by the gentiles. So if they are to learn about these things from the gentiles, the first step will be educational. Gentiles need to become converted to the beliefs of the Book of Mormon, then bring these correct beliefs to the remnant. The remnant may have a glorious destiny, but not until after first the gentiles who believe in the words take them to the remnant and teach them.
Even if you knew the Hopi were the right people, that does not accomplish what the promises foretell. The remnant must be taught the truth. That will be taught by believing gentiles. We don't have many of those yet. So to deliver a copy of the Book of Mormon to a Hopi and expect that to result in spontaneous combustion producing light, truth and glory is at best a naive notion and at worst absolute foolishness. It won't happen that way. The right people must be brought the right message by a believing gentile, preaching the fullness of the Gospel to them. When that happens, Nephi's prophecy may begin to unfold. We lack qualified gentile ministers at present. They labor under condemnation for not taking the Book of Mormon seriously or remembering the covenant made within it. So the first step is to convert a few gentiles.
Nevertheless, this is an important subject and worth taking time to understand. But with this, as with almost everything else in the Gospel, having it measured correctly and weighed in proportion is the only way to understand. So we proceed step by cautious step to try and dismantle false and corrupt notions, and to assemble the true ones. You must be patient to understand the Lord's plan. And therefore we proceed patiently in this subject, as well.
Patience is more than a virtue. It is critical to participating in the Lord's plan.