I see many of us in this situation, often giving up hope that our family members will ever accept Islam in truth; and this is something incorrect. Rather we should continue to put our trust in Allah, and know that it is Allah alone Who guides.
We are living in a time where Muslims are in the millions subhanAllah, and its easy to forget that the early Muslims indeed had non-Muslim relatives, including the Noble Prophet ﷺ himself. And from them all is a great example for us to look to.
Allah commands us to be dutiful to our parents - regardless of whether they are Muslim or not, and to obey them in all matters except if they order us with disobedience to Allah.
This short e-book is only 10 pages long, but provides a good lesson for us to benefit from bi'ithnnillah.
It is available to read as a PDF file from Abdurrahman.org as well as on Scribd.
(if you have a tablet device, I really recommend you head on over to Scribd and download the Scribd app, because it is a free e-reader similar to Kindle, allowing you to easily read e-books such as this easily Alhamdulillah.)
Interacting with non-Muslim Parents PDF file
Interacting with non-Muslim Parents Scribd (readable on PC as well as mobile devices)