When someone says their sister-in-law is “bananas,” it often means she has a quirky, eccentric, or overly energetic personality that stands out. It’s a playful way to describe someone who might have unconventional ideas or behaviors, or who simply brings a lot of energy and unpredictability into situations. People with such vibrant personalities can add a lot of color and excitement to family gatherings and everyday life, making moments memorable and often, more enjoyable. It’s always interesting to have someone in the family who can surprise you and keep things lively!