My family has always been a major stress on my life. The drama never ends and they treat my wife badly. They also have borrowed money from me numerous times and don't bother to pay me back. Am I obligated to continue speaking to them?
Yes you are obliged to always be keep good relation with them because they are your family from which Allah (SWT) Has created you. Stopping speaking with them will never help you but will increase your problems as well as make you a sinner. Those who cut ties or have bad dealings with their relatives are cursed by Allah in Quran.
Wassalam.