Thank you for your ministry. I suppose the 144,000 will somehow know their tribal ancestry. Perhaps, you’ve already dealt with this subject and I haven’t located it yet. Thank you.
In Rev. 7:5-8 we see that between the 6th and 7th Seal judgments the Lord will call 144,000 servants from the tribes of Israel. I don’t know if those who will be called will know their tribal affiliation ahead of time. It’s possible that some of them could, but the consensus among Jewish experts is that most people alive today don’t know their tribal affiliation.
But the real answer to your question is that God knows who belongs to what tribe, and when the time comes He can call them according to tribe and number, whether they know their tribal origins or not. We can believe this because of the specific wording of Rev. 7:5-8. He will call 12,000 from each of the 12 tribes He had John name.