It could be a rocky start. Harry may not trust Tom because of Tom's rather mysterious past. But as time goes on, Tom reveals his reasons for staying away from the family for so long. It could be to protect them from a certain danger. As Harry understands more about Tom's sacrifices, their relationship could transform into a very close and trusting one, with Tom becoming like a mentor and father figure to Harry.
At first, Harry might be very suspicious of Tom. After all, he has had so many people with hidden agendas in his life. But as Tom shows his genuine care for Harry, their relationship could start to warm up. Tom could start by teaching Harry some unique spells or magical techniques that he learned from his own adventures.
At first, it could be very strained. Tom might be resentful or confused about having Harry as a father all of a sudden. But as time goes on, if Harry shows love and support, Tom could start to warm up to him. For example, Harry could help Tom with his schoolwork or magical training.
At first, it could be a relationship based on trust and mentorship. Tom, as the godfather, might teach Harry some unique magic skills. But as Harry realizes Tom's darker side, it would turn into a strained relationship full of tension and conflict. Harry would struggle between his loyalty to his godfather and his own moral compass.
At first, it would probably be very tense. Tom is a proud and intelligent boy, and he might not take kindly to being adopted. But as Harry and Hermione show him kindness and understanding, he could start to warm up to them. For example, Hermione could introduce him to books that expand his view of the wizarding world in a positive way, and Harry could share his own experiences of growing up without parents, making Tom feel less alone.
At first, it would probably be very difficult. Tom is a complex character with a lot of pride. Harry, on the other hand, has a deep - seated hatred for Voldemort. But as Harry gets to know the young Tom, he might start to see him as a lost child. Their relationship could slowly shift from one of suspicion to a more paternal - like bond as Harry tries to mentor Tom.
At first, it would probably be really tense. Tom is used to being on his own and having his own dark thoughts. Harry would be super cautious. But as time goes on, Harry's kindness might start to break through Tom's barriers. They could become like brothers, with Harry teaching Tom about the good in the world and Tom starting to trust Harry.
Their relationship could start as a rivalry. Hermione, being the studious and rule - abiding type, would likely be put off by Tom's more devious ways. But as they interact more in the private school, they might find common ground in their intelligence. For example, in a difficult class, they could be the only two students who understand a complex concept.
At first, their relationship might be one of student - teacher, with Harry being curious and Grindelwald being manipulative. Harry would be eager to learn from Grindelwald's vast knowledge, but gradually he would start to sense that something is not right.
As the teaching progresses, they could develop a sort of mentor - mentee relationship. Harry would be constantly trying to steer Tom away from the Dark Arts, while Tom would be trying to learn as much as he can from Harry. However, there would always be an underlying tension because of Tom's future as Voldemort. Their relationship might be a complex dance of trust and suspicion.
It could start with a simple conversation in the library. Daphne might be reading a book on dark magic defenses and Harry asks her about it. From there, they start to exchange knowledge and stories. As they learn more about each other's pasts and dreams, their relationship blossoms into a deep friendship or even something more romantic.
In the fanfiction, their relationship would be a complex journey. Since they are from different eras in a sense, they have different values and ways of thinking. However, being in the past together forces them to communicate and work as a team. Harry might initially be distrustful of Tom because of his Slytherin nature. But as they experience things like the old magic of the past, they begin to understand each other more deeply. They might start as reluctant allies but end up as true friends who have changed each other for the better. For example, Tom could learn more about the importance of love from Harry, and Harry could understand the allure of power from Tom without being corrupted by it.