WOW.
Sooooo, you can only offer "suppositions" as to why Mary's "other children" couldn't care for her because the Bible is SILENT about it.
Yet you insist that she indeed had "other children" - when the Bible is just as SILENT about it.
I hope you don't run your personal life with the SAME kind of confusion . . .
Well your ignorance of the SCriptures are showing. The Bible doesn't declare as to the why Jesus handed over Mary's care to John, just that He did.
But as to Mary having other children:
Matthew 12:
47 Then one said unto him, Behold, thy mother and thy brethren stand without, desiring to speak with thee.
48 But he answered and said unto him that told him, Who is my mother? and who are my brethren?
49 And he stretched forth his hand toward his disciples, and said, Behold my mother and my brethren!
50 For whosoever shall do the will of my Father which is in heaven, the same is my brother, and sister, and mother.
Mark 6
King James Version
6 And he went out from thence, and came into his own country; and his disciples follow him.
2 And when the sabbath day was come, he began to teach in the synagogue: and many hearing him were astonished, saying, From whence hath this man these things? and what wisdom is this which is given unto him, that even such mighty works are wrought by his hands?
3 Is not this the carpenter, the son of Mary, the brother of James, and Joses, and of Juda, and Simon? and are not his sisters here with us? And they were offended at him.
Matthew 13:54-56
King James Version
54 And when he was come into his own country, he taught them in their synagogue, insomuch that they were astonished, and said, Whence hath this man this wisdom, and these mighty works?
55 Is not this the carpenter's son? is not his mother called Mary? and his brethren, James, and Joses, and Simon, and Judas?
56 And his sisters, are they not all with us? Whence then hath this man all these things?
Please don't try the "cousin thig. that doesn't fly linguistically, grammatically, contextually or culturally ! Jesus had at least four brethren and two sisters according to Gods Word!
JOseph and Mary , once Jesus was born, did a lot of knowing each other as a good jewish husband and wife would do according to the law.