Stekel and Roth family connection.

I am trying to link the Stekel and Roth families. Dr Wilhelm Stekel was born in Boyany as was Bernhard Roth. The Roth's apparently moved to Beilitz-Biala and then to Vienna. Stekel moved to Vienna where he was a renowned psychoanalist. Stekel became guardian to Erich Roth and his brother also named Sigmund, upon the death of Sigmund Roth, brother of Bernhard, in 1908. Stekel was an uncle to Erich and the young Sigmund. Their mother was Babette Roth, nee Seinfeld.

I am hoping to find the link that shows the blood relationship. Any help is appreciated.

John Roth