H.N.
B. - That is a really tough situation. The best resource may be a professional, like a therapist or psychologist.
Aside from that, I have just have my own childhood. (I only have one child now, but I was the second of four kids.) My mom did a great job with us, often compensating for Dad's gaps in attention. She was a master at telling us how much he loved us and how he talked about us. I realize now that it may not have been all true. But it did encourage us to spend our attention on Dad when he came home each day. I occurs to me now that Mom removed a barrier between dad and us - by telling us that he wanted to be with us, we simply wanted to be with him. Kids who display love and attention for an adult often win that adult's devotion and attention.
I wish I had better advice or experience to offer. Best of luck to you.