@gigiz it's more due to the fact that Ginny's last act was delivering the baby into the world, and Kuma loved her and vowed to protect the child she left behind. Also although she's not his "real" daughter, he raised her, loved her and sacrificed for her, he is her father 
:P
check out my profile and lists for manga recommendations if you want
check out my profile and lists for manga recommendations if you want
