Is it normal to have a crush on your sister-in-law?
Yes—having an unexpected crush on your sister-in-law can happen, and it doesn’t mean you’ve done anything wrong. What matters is keeping respectful boundaries and not turning the feeling into behavior that could hurt your family relationships.
Crushes aren’t something you always choose, and they can show up in awkward places—including within your extended family. Having the feeling doesn’t automatically mean you want to betray anyone or that something is wrong with your relationship.
People may feel differently about what to do with it, but keeping things kind and uncomplicated is usually wise: don’t flirt, feed it with private intimacy, or make a confession that would mainly put the burden on her. Give the crush some space to fade, and focus on the boundaries and relationships you want to protect.