Will a person be questioned on the Day of Resurrection about his siblings who do not pray, or whom he did not teach matters of their religion and what benefits them from it, especially if they do not wish to pray, or if they pray but not in the mosque, which causes them to miss learning some religious matters?

If you are a guardian over your siblings, you will be held accountable for them on the Day of Resurrection if you neglect their care, education, and encouragement to adhere to Islamic law, based on the Almighty's saying: "Protect yourselves and your families from a Fire," and the Prophet’s (peace be upon him) saying: "Each of you is a guardian and is responsible for his subjects." If you fulfill your duty and they do not respond to you, then you are absolved of responsibility. However, if you are not a guardian over them, you still bear the responsibility of advising and guiding them due to their extensive right over you, just as Allah commanded His Prophet to warn his nearest kin.