There could be. Some dads who are not accepting of their child's homosexuality might act in an abusive way. They might try to force their own beliefs on the child, and when the child resists, they lash out. This can range from emotional abuse such as isolating the child from their support system to more extreme forms of physical harm.
One sign is excessive jealousy. Just like in a story where one partner won't let the other talk to anyone else, always suspecting infidelity. Another sign is isolation, when a partner cuts the other off from friends and family. Also, verbal abuse such as constantly putting the other down is a sign.
One common theme could be the exploration of the psychological impact on the characters due to the abuse. For example, the children in the fanfic might show signs of trauma like fear, low self - esteem, or difficulty in forming relationships. Another theme could be the struggle for the abused characters to break free from the cycle of abuse. They might try to find ways to stand up to their abusive dads or seek help from others.
One story could be about two men, Tom and Jerry (not the cartoon characters). Tom was very controlling in the relationship. He would constantly check Jerry's phone, not allowing him to have friends of his own. He often verbally abused Jerry, saying mean things when Jerry didn't do as he wished. Jerry felt trapped but finally found the courage to leave after a long struggle.
There was a gay couple, Tom and Jerry. They had always dreamed of having a child. After a long process of adoption, they finally became dads to a lovely little boy. They provided a warm and inclusive home for the boy, filled with love and acceptance.
There may or may not be a 'Wrestling Dad' gay story. It could be that someone is trying to create or promote such a story to bring more diversity and representation to the wrestling - related story genre. However, without more context or research, it's difficult to say for sure whether it exists.
Craig's dad might be abusive by being overly critical, setting impossible expectations, or even taking away things that are important to Craig. There are many possible ways this abuse could play out in the fanfic.
Isolation from other friends and family can be a sign. If your gay friend tries to keep you away from your support network, it might be part of an abusive pattern. Also, if they violate your boundaries physically or emotionally without respecting your no, it's a sign of potential abuse.