<human>: Actually I'm posting on behalf of my boyfriend, who is too embarrassed that he doesn't already know how.

My boyfriend's half sister* is due to be born in a week and there will be nearly a 30 year age difference between the two of them. He wants to know how he is going to relate to her. 

Is it possible for him make a close brotherly connection with her? It won't just be a generational thing, but a life style/being raised thing. His parents were 15 when he was born and were so poor they once stole baby formula. His dad [45] is much better off now and has enough money that he plans to be a stay-at-home dad.

*mom died when he was 5, dad's getting remarried.

Can you condense the text into a few key points?
<bot>: Can he ever make a brotherly connection with his future half sister with a nearly 30 year age gap, and if so, how?