Abby Slater 47. "What causes sibling rivalry? Having more than one kid." –Tim Allen 48. "Siblings that say they never fight are most definitely hiding something." –Lemony Snicket 49.

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Scientists in the study followed the lives of 6,838 children until they were 12 and studied their family dynamics. The study ...

A hilarious Instagram video featuring two dog sisters with contrasting temperaments is making the rounds on the internet. The ...

Most cases of sibling rivalry involve mild spats or tension ... time — without pigeonholing them as "the smart one" or "the funny one." For example, you can congratulate your kid when they ...