If you have siblings (either gender) but are not close with them, your chance for developing depression later in life is greatly enhanced, according to a new study.

Dr. Robert Waldinger, lead researcher on the study, says that "having a close relationship with even one of your siblings made you less likely to be depressed." Data from 229 men was collected from the teenage years until those same men were in their 50s. Quality of life was then compared to how close each man was with his siblings over that same time period.

It's interesting that the data from this study took 68 years to collect, making it one of the longest studies of adult psychosocial development every done, according to Dr Waldinger.