So sorry your family have asked you to do this. Very sad indeed. Once you become a mother it's you and your new family. I have seen girls who have done this due to pressure from family or given up their babies for adoption and honestly, they have not been the same mentally. Very sad.
Please keep your baby, no matter what the situation is. Your family will come around one day and hopefully love that child too. It's not the babies fault. Wishing you all the best