Well, we have the names of a dozen-odd relatives of Jesus who survived his crucifixion, several of whom became prominent in the Church, and at least two of whom apparently contributed books to the New Testament (James and Jude).
Surely that qualifies as "additional information".
But the trail goes cold at that point, wouldn’t you say?
Seems like good advice to me.
A more fruitful study might be to devote oneself through faih in Christ to studying the doctrine of the bride of Christ as described in Scripture. If one is tempted to investigate claims of a bloodline, then one might approach the study from the more orthodox approach by studying what our Lord has to say about His bride, who it is, His stance on adultery, and trustworthiness assuring us that He has but one bride, (The Church). In order to understand His doctrines on the topic, one will grow by God the Holy Spirit in understanding how His bride is formed. Then draw your own conclusions, through faith alone in Christ alone. All faith is from God.