My family follows the Sunni school of thought, but I follow the Ahl al-Bayt. They are unaware of my beliefs. Should it be my responsibility to inform them about my religious path? How would God view my decision to keep this information to myself?
It depends on the situation of your family. If your family members are flexible and open minded and appreciate evidence and believe in freedom of faith, then you can inform them that the authentic evidence guided to to follow Ahlul Bayt (AS). You can also give them some important points which guided you to Ahlul Bayt (As) which can help them not only to appreciate your research for the Truth for your life here and hereafter, but also open their minds to think properly about the Reality of Real Islam of the Prophet and his Holy Progeny.
'If your family members are rigid and closed minded and do not respect evidence nor freedom of faith and want to remain blindly following their fore fathers, then it might be harmful to inform them because it might create enmity and hatred against you.
'Keeping your faith secret is the option of thousands of believers who live in a negative surroundings which can harm them if they disclose. This is called Taqiyya which is mentioned in Quran in many verses. Allah Did Praise in Quran (Sura Ghaafir; verse 28) a believer from Firaon family who was hiding his faith.
Wassalam.