ANSWER:

She must wear the niqab in front of non mahram family members as well. It’s not permissible for her to chit-chat, hang around or socialise with them at all. Therefore, she simply ignores them and not reply to them if they insist on mixing with her and socializing. 

How must one who wants to start wearing niqab deal with the non mahrams in her family who don’t view it as obligatory? Also if she wears niqab can she go chat with them but wearing niqab, not alone in the room together. Is it impermissible to chat regularly with non mahram family members? Thank you