My son

Hi i am sujith Muralidharan Staying at faridabad i married on april 8th 2012 And after two months my wifes parents came and took her to their home at mahipal pur delhi,and told me to stay with their at mahipalpur and i rejected the offer.and on february 23,2013 she delivered a baby boy of me and now my brother in law is not allowing me to see my son.pls suggest me the right way to get rid of this problem.