If you grew up with siblings, you probably know that it’s not a walk in the park. AdvertisementWhen asked about the study, lead researcher Professor Tony Cassidy said, “Sisters appear to encourage more open communication and cohesion in families. This isn't the first study on sibling dynamics and how brothers and sisters differ in offering support and improving family well-being. And I suspect that is what is driving that mental health finding.” Most guys don’t have these qualities that women appreciate because they don’t have the influence of growing up with sisters.