Gifting process by in laws residing in foreign country

Hello, I would like to seek advise on what is the process if in-laws who are residing in foreign country (Bangladesh) wants to gift a sum of money to son-in-law who is an Indian? I heard a gift deed is required to be made, but if this is the case what will be the place of execution i.e. which country it has to be made and what is the tax implications or documents required on both sides? Thanks to share opinion.