Broken relationship with older sibling

[Imoan]

Hello, I have an older sibling by 3-years and he devalues me in every way possible.  He has virtually disowned our kin relationship.  He has two children (one deceased) by his first marriage that I both adore and love.  He remarried and had another child now 22-years old, but he kept her away from me. I met her once at the age of 3-years old and asked if she would take my hand while crossings a busy parking lot, and my brother responded with, "we have taught her not to speak to strangers"  although I was hurt I did not respond; again, that was the only time I met her.  My nephew (54-years old) recently passed away from Bladder cancer, and my brother told him during his illness that I was not next of kin.
I wanted to be involved with his cancer journey but was limited in conversations concerning his illness.  Additionally, I received several degrees late in life and he recently sent me a college announcement of his daughter that was a made-up graduation announcement, in our recent conversations he's never mentioned being proud of me bc of my accomplishments in this area, but only brags on his daughter and her accomplishments.  EXp. she graduated from a top school in New York, Columbia and she speaks several languages, etc.  However, I researched on two sites her accomplishments and found on linked-in she was attending Eastern Michigan University and on another site that she was a health care worker.  He doesn't know I know this, in the past I broke off our relationship because it was toxic and only begin speaking again because of the death of my nephew.  How do I deal with him if I want to continue a relationship with him?

[Cat Familiar]

You might get more replies on the Parent and Siblings Board. I’ll move your thread there.

What do you imagine the motivation is for him to lie about or embellish his daughter’s CV?