Hii gud morning dear . Hope u r doing good . Dear there are so many option for gift as u can give any gold gift as chain ,ring ,ear ring or bracelet. Or u can give any home appliances as fridge ,TV,washing machine ,microwave, chimney ,ac too ..so I think onde ask to ur sister in law she ll tells u according to her requirements .. last month v also went to my sister in law home for grah pravesh..v gifted ac to her too so u can choose any of them or once ask to ur sister in law too.