It's not. The character is older than yours. In fact, you should have asked if you were allowed to be related to him, or at least the person creating your character should have.
You trying to force this 'relationship' to be non-canon is factually retconning the character that is older than yours.
And you don't honestly expect me to reply on your discord messages if what you say there immediately contradicts what you said on the forums? Yes, you did try to retcon. And no, you didn't try to 'sort something out'. What you did was yell at other people for a while that were upset because you tried to rob their characters of parts that were part of them since their inception.