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Hadock’s Catholic Bible Commentary on Luke 3 clarifies this for us:The genealogy in BOTH Mathew and Luke is of Jesus through Joseph, not Mary.
…we must acknowledge in the genealogy in St. Luke, two sons improperly so called, that is, two sons-in-law, instead of sons. As among the Hebrews, the women entered not into the genealogy, when a house finished by a daughter, instead of naming the daughter in the genealogy, they named the son-in-law, who had for father-in-law the father of his wife. The two sons-in-law mentioned in St. Luke are Joseph, the son-in-law of Heli, and Salathiel, the son-in-law of Neri. This remarks clears up the difficulty. Joseph, the son of Jacob, in St. Matthew, was the son-in-law of Heli, in St. Luke; and Salathiel, the son of Jechonias, in St. Matthew, was the son-in-law of Neri, in St. Luke. Mary was the daughter of Heli, Eliacim, or Joacim, or Joachim. Joseph, the son of Jacob, and Mary, the daughter of Heli, had a common origin; both descending from Zorobabel, Joseph by Abiud the eldest, and Mary by Resa, the younger brother. Joseph descended from the royal branch of David, of which Solomon was the chief; and Mary from the other branch, of which Nathan was the chief. by Salathiel, the father of Zorobabel, and son of Jechonias, Joseph and Mary descended from Solomon, the son and heir of David. And by the wife of Salathiel, the mother of Zorobabel, and daughter of Neri, of which Neri Salathiel was the son-in-law, Joseph and Mary descended from Nathan, the other son of David, so that Joseph and Mary re-united in themselves all the blood of David.