It's really your choice whether you love someone or you don't. You are not under any obligation to love this little baby because he is your nephew, nor are you forbidden from loving him no matter how badly you think of his father. If it seems impossible to love, it could be because you live in the past, not the present. You discard the present, in fact, and prefer to remain in the past.

Perhaps this current situation can help illuminate what a prison you have created for yourself with holding all these grudges against people who should have loved you, but did not, just as you are about to do to this little innocent, fresh in this world.