Long story as short as possible, I didn't meet my biological father until I was 20 years old due to various reasons. He moved 200 miles away when I was born but has another daughter that lives 5 minutes from me (who I also didn't meet until I was 20) we only met as I always felt I didn't know a part of me. He wasn't so keen asked my mum to get a DNA test (he knew I was his child but was for the benefit of his wife and other daughter). In the end we met and stayed in touch for a couple of years I went up to his to see him for weekends and him and his family would come down to me sometimes too.
The last time I saw him was two years ago at my wedding, we've exchanged text messages every now and again.
Now I've had a baby myself and the immense love I feel for my baby I couldn't imagine ignoring him or not wanting to know him for the first 20 years of his life. It makes me think do I really want to have him in my babies life for him to not bother? My baby is now 4 months old and he hasn't made any effort to want to come and see us? He has text me twice asking for a picture which I've sent.
As I said earlier he has another daughter who lives 5 minutes from me who has a son which he sends money to every birthday and Christmas and goes to visit them. I've not had a card for at least the last 2 years and nothing for my baby which isn't the point but he's not even met him!!!!!
So do I bother to even make an effort with him or flit in and out of our lives 
I obviously have major dad issues which I also feel immensely guilty about as oh father passed away so please 
Longer post than I thought .. think my fingers have burnt how fast I've written this 