I had two older brothers, 8 and 10 years older. I always got on well with my eldest brother but the middle one always had a chip on his shoulder, probably jealousy, I imagine. He moved to London early and never returned. We always had a delicate relationship but we did go to family weddings, funerals etc. There were huge problems when my mum was older and had dementia. Both brothers left it all to me but this brother kept saying he'd do everything if he was here and he could (which is easy to say) and criticising and questioning every decision I made.
At my eldest brother's funeral, the middle one and family spent all their time with the eldest brother's ex-wife and her family and not us and sister in law and family! Long story. Despite me saying we must keep in touch now, there's only us two now and him agreeing, that's been it! No cards, no contact, didn't even tell me of his new address until I requested it from his daughter on FB!
He's in his mid 70's now but I imagine he's determined to outlive me, even though I'm 8 years younger. Has always been v proud of his fitness, looks etc. I do not know what I've done, other than be close to my eldest brother as we only lived a few miles apart. It's sad though, my mum would be very upset, she wanted us all to be close when they'd gone.