Is it normal to cuddle with your sister?
Yep.Totally normal
Yes, cuddling with your sister can be a normal way to show affection. Families vary in how physically affectionate they are, so what matters is that you both feel comfortable with it.
Yes—siblings cuddle for comfort, affection, or just because they’re close. Some families are big on hugs and cuddles; others show love in less touchy ways, and both are perfectly normal.
The simple rule is that you should both be comfortable and free to say no or stop. Keep it within the same nonsexual, respectful boundaries you’d expect in your family.