Alumni & child maintenance

I got married in Dec'99 according ( hindu marriage, conset & presence of both families), blessed with son i n Dec 2001, Got seperated i oct' 02( gone through lots of mentle torture, domestic violence of mother in law & husband. and husband is always at mother in law side). Oct 2002 I struggled a lot, I worked in pvt co sometimes I ve job and sometimes I dont ve job, my father is retd as sub from army. Some how I managed the show, but now son is growing and his expenses r gone up according to time, in fact 2016 we again in touch with my husband he and his family realized his fault and my husband started supporting my son but again he is vanished and taking no responsibility of my son, even not picking my son's phone. As I am touching 50 so I am not getting job which i can manage with my old parents and young growing son. I am from simple, middle class family. Initially I started legal way, unfortunately i ve got no proper guideance everybody is interested in his fee only. I ve very limited salary either i could earn for my son or i could chase them as he flies to USA. So I never pursue my legal case. So could u guide me what could be done? before marriage my husband hided his physical problems. but i adjusted as i am from very reputated family, after our son birth they made my life hell, once i came to my parental house he never offered any financial help, in fact when i started legal way he flies to US and never offered any help. his whole family is supporting him. In 2016 he came in our touch, again assured us and helped us for one year and again vanished. His sister told me to get marry with other guy so other guy will bear my all expenses and my son's expenses as my husband is in living relationship with some other lady in U.S. So without settle any sort of legal way he is enjoying his life and me and my child is suffering. I I were professionally qualified I never claim for anything as I am fade up this fraud family, and this spineless man.. still Iam not looking for mine comforts I am worried about my only son's future. could u guide me. again i am saying i ve no money for legal procedings. I am managing my show with the borrowed money. I wrote everything to my husband but he is not paying any attn. earning