[ealgeone]

Why did Christ entrust His Mother to St. John, but His Church to St. Peter? And where were all these so-called "siblings" at the Pentecost or the Ascension?

14These all with one mind were continually devoting themselves to prayer, along with the women, and Mary the mother of Jesus, and with His brothers. Acts 1:14 NASB

[ebb tide]

[14] All these were persevering with one mind in prayer with the women, and Mary the mother of Jesus, and with his brethren. [15] In those days Peter rising up in the midst of the brethren, said: (now the number of persons together was about an hundred and twenty:) Acts 1

The above is the full quote from Douay-Rheims. Was Peter Christ's sibling? Or are you cherry-picking again?