Not physically abusive (though the protagonist's grandparents are briefly described to have been), but father is mostly absent and mother is emotionally distant to her children.
Off-screen, but a child experiences repeated unwanted sexual activity (described as touching but it is vague, but described as rape). Also another offscreen event later in the story.
Protagonist is misgendered by a neighbour in an early flashback, but is corrected and does not happen again. Later, a character repeatedly corrects usage of "sister" to "sibling" (protagonist generally uses they/them pronouns).
A guinea pig is killed (pencil through the eye), some fish are found dead in their tank, ant farm is destroyed and the ants killed. In all instances, the deaths are offscreen and the animals found later.