Jesus never claimed that Mary wasn’t His mother.
And the verses you referred to indicate that following Christ sometimes requires one to break with the past. No excuses - remember that He said this in answer to the man who didn’t want to follow Him who was admonished for his excuse-making.
Christianity is very much about the family. This is just crazy talk.
I have a better way to phrase it. He put all Christian women at the exact same level, and that clearly includes Mary.