minor children custody case in Dubai and Delhi

Well u see my sister is living n Dubai currently she was married here nd had two kids from the marriage, the husband without my sister information nd permission took her kids age 1 and 2 years to India leaving them n the care of his mother n Delhi. so when he returned to continue with his work n Dubai we went to court so that he returns the kids, fortunately the court passed judgment n my sister's favour but still the husband refuses to gve the kids nd therefore is n Dubai jail since 3 months. I would like to inform u that the both my sister nd her husband r Indian national residents of Delhi. n my sister has not seen her kids n 1 year 3 months nd the father has given the daughter to someone else for care take again separating the two kids. my question is how can I get my kids now as this is the maximum Dubai government can do. can I use the custody judgment paper of Dubai government in Delhi to get my kids