Regarding My Son's Custody From My Own Family (father&brother)

Myself Ritika, I put up in rohini sector-11. Needed a advice from you regarding my son's custody from my own family (father and brother). Actually meri first marriage 2015 mein hui thi jisse mujhe beta hai (AARAV) jo abhi mere father ke ghar mein hai..Mera Bhai unmarried hai Jo usey dekhta hai. He's going to complete 4years next month nd read in Titiksha juniors. Issue ye hai ki maine is saal may mein apni marzi se shadi karli thi (jisse mere father khush nhi hai) after being pressurised ki "tu Ghar mein bethi hai Tere Bhai ki shadi kaise hogi" my brother and my father both used to tell me this every second day. (Unhe mere husband k baare mein pehle se pata tha mil bhi chuke the ek bar). Main thoda financial crisis face kar rhi thi jiski vajjah se maine apne Bete ko kuch time ke liye unke pas choda tha ki vo bas thoda time usko dekhe as i was working with an advertising agency for 8k. (Left the job last month) Uske school se unhe uske kuch aise pictures or videos mil rhe the ki vo likhta nhi hai thik se. (he's a premature baby) uske doctor ne bhi kaha hai ki vo 18months delayed rhega baki normal born bacho se. Par uske nana uske sath bohot aggressive ho gaye hai usey maarte hai abuse krte hai vo rota rehta hai Mera Bhai mujhe videos record karke WhatsApp karta hai ki usko Kya treatment mil rha hai vha. Meri unse koi batchit nhi hai after whatever I did as He's not happy with it. But abhi problem ye hai ki unhone usey, mujhe dene see Mana kardia hai ki main financial crisis face kar rhi hu to unse help hi maangti rahungi ek bar vo mere paas aagya to. Mujhe ab usey Dekhne k liye bhi koi source nhi bacha. Or mujhe property mein mera right bhi dene see mana kardia hai. Please suggest me what should I do.