Idk how to talk to him

So ummm... I wanna get close with my brother. I don't have a clear memory of him being close to me except for that one time when I was at his collage graduation. We don't talk too much with each other and if we do, it would just be like a conversation between strangers more than siblings. And the age gap between us is too big, like 13 years gap is no joke. As much as I wanna know more about him, he's too busy at with work abroad and when he comes back home, he usually doesn't stay at our house.

He doesn't have a family but he does a have a girlfriend and I don't usually talk to her too. We're not really in bad terms, but it's just awkward when we talk to each other since we're not close obviously. Same thing applies to my brother. He recently gave me a gift and I did thank him. I just think that my thanks was not good enough.. idk maybe I'm just overthinking things. But I do hope you guys would give me some advice on how to communicate with my brother. Really appreciate it. And thanks for reading.