Verso: ... it's complicated. (he loves him, though. He just doesn't agree with the painted version, and he has absolutely no illusions that he's anything of importance to the other one.)
Elwin Rosfield cares for his boys, and will take the time from his active ruler duties to explain things about life and the world to is 10 year old sickly younger son, and he'll both push his older son and make sure (while he can) that he's not alone to face dangers. He trusts his boys, and they love him.
Beiyuan: his dad was, uh. In heavy mourning for the loss of his wife. He basically tried to not have contact with Beiyuan because he looked so much like his mom. The old prince died when Beiyuan was 10. There are aspersions that Beiyuan may actually have been the emperor's son, which isn't all that much better...
Luo Wenzhou's dad is very good and solid. Wenhzou respects his dad and has a healthy dose of fear of him, but trusts him, too, and also loves him. Wenzhou's dad, a government official, is aware of the fact that Wenzhou is gay and supports him.
Angeal's dad was a good man of poor health. He supported his son but also overdid that part a bit, and instead of waiting for Angeal to start earning enough to send home, he overworked himself to pay the debt for the Buster sword and his health could not take that.
Larsa's dad ...well, he was a bastard, sneaky backstabby emperor who made his third son kill his two elder sons.... But Larsa loved him very much anyway.
Xichen and Wangji's dad... should have had someone to properly shake him. I am still saddened by the implications of 'he loved the woman but she did not return the feelings' in conjunction with 'he married the woman and fathered two children with her and kept her prisoner'
Theo's dad was ready to turn him in to the authorities when it was discovered he could use magic. Theo's sister just took her brother and ran, and neither of them really looked back.
/waves at Li. Suzaku's dad was very authoritative, implied abusive, and had certain political views... well, long story short, Suzaku killed him when he was all of ten years old. Given that Suzaku is not inherently cruel person or someone who kills indiscriminately, that... says a lot.
LATE. Sizhui does not remember his biological dad (he died before Sizhui was 3 years old and most people who could tell him about him also died around when he was that old...) but he loves both his adoptive dads completely.
first soldier has been showing Angeal's dad for THREE CHAPTERS OR SO but still hasn't given us a name, squenix, BLS