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Again, it is specific to him giving care of his mother to a non-relative. He would not have done that.

based on what Scripture?

We know from the Bible that Mary and Joseph had sex, that Jesus was the firstborn, meaning others were born after, and we know that he had siblings from the bible.

So where in the Bible is it a sin for Jesus to give care of Mary to John?

Again, it is specific to him giving care of his mother to a non-relative. He would not have done that. Maybe Luther or Zwingli decided otherwise.

John, chapter 5
1: After this there was a feast of the Jews, and Jesus went up to Jerusalem.
2: Now there is in Jerusalem by the Sheep Gate a pool, in Hebrew called Beth-za'tha, which has five porticoes.
3: In these lay a multitude of invalids, blind, lame, paralyzed.
1 5: One man was there, who had been ill for thirty-eight years.
6: When Jesus saw him and knew that he had been lying there a long time, he said to him, "Do you want to be healed?"
7: The sick man answered him, "Sir, I have no man to put me into the pool when the water is troubled, and while I am going another steps down before me."
8: Jesus said to him, "Rise, take up your pallet, and walk."
9: And at once the man was healed, and he took up his pallet and walked. Now that day was the sabbath.
10: So the Jews said to the man who was cured, "It is the sabbath, it is not lawful for you to carry your pallet."
11: But he answered them, "The man who healed me said to me, `Take up your pallet, and walk.'"
12: They asked him, "Who is the man who said to you, `Take up your pallet, and walk'?"
13: Now the man who had been healed did not know who it was, for Jesus had withdrawn, as there was a crowd in the place.
14: Afterward, Jesus found him in the temple, and said to him, "See, you are well! Sin no more, that nothing worse befall you."
15: The man went away and told the Jews that it was Jesus who had healed him.
16: And this was why the Jews persecuted Jesus, because he did this on the sabbath.
17: But Jesus answered them, "My Father is working still, and I am working."

Your "it is specific" is a perfect example of cherrypicking. Jesus violated Jewish law and, by your standard, sinned. Now you feel qualified to determine which Jewish Law he would or would not obey.