In one life, Petunia Evans would have fallen in love with a man named Vernon Dursley, and with that love the resentment she held for her older sister would have grown. In another life, she would nurse Jacob Grimm back to health after an accident left him widowed, later falling in love and marrying the much older man. With Jacob's patient determination, she would reconnect with her younger sister.
In one life, Harry Potter would grow up unloved, and would have to contend with the bullying of his cousin. In another life, he would grow up loved by his Aunt Petunia and Uncle Jake, and he would have a big brother in the form of his cousin Ben.
In one life, Harry Potter would marry Ginerva Weasley, and stay with the family he found in the Wizarding World. In another life, he would marry a French Flower, the only person he had met who could set his heart alight.
In one life, Harry would go on to become a successful Auror, and help bring a level of security to Wizarding Britain. In another life, he would leave for New York with his wife, after he got a call from his cousin about something happening on a space flight...and his life would never be the same afterwards.
(a little thing that came to life when i remembered that dear old Ben Grimm has an Aunt Petunia, fairly obviously a Fantastic Four crossover, with some obligatory flowerpot)