A stepbrother might be a new family member. Their presence can change family relationships and dynamics. Since my parents remarried, I've had to adjust to having a stepbrother.
Pro Tip 2/3
Not Biological
It's important to know that a stepbrother is not related to you by blood but by marriage. Even though my stepbrother and I don't share parents, we're really close.
Pro Tip 3/3
Family Terms
In conversation, some might use 'brother' and 'stepbrother' interchangeably, depending on their relationship. My stepbrother is just like a real brother to me.