A single mother with a son feeling unsafe in my own parental home. Kindly advice.

I am a working single mother aged 40+ with a 11 year old son. My divorce happened in 2012 owing to ill treatment by my husband towards me and my then newborn child (born 2008) and we were separated since 2009. Since then I stayed at my parents house in Kolkata and immediately resumed working (was already doing a good job in Bangalore) to support myself and my child. I am the sole financial supporter to my child as I didn't claim any monetary compensation (as advised strangely by my lawyer). Post my divorce however, husband never claimed custody or met us including the child ever. My parents however are aged nearing their 70s but they (always) keep threatening me and my son, reminding us of our dark past and we get threatened to an extent that it almost becomes suicidal. They never helped me monetarily, nor did I ask for any and instead I pay a heavy amount to the family towards food and every other expenses. Now they warned us to leave as we are burdensome. My son and I plan to relocate and I'm desperately looking for a job and boarding school in another city. But till such time, we want to feel safe. Have lost all peace of mind owing to everyday. Request your advice on how to cope with this unpleasant situation. My email ID: [deleted]