What is the limit of dealing with family members who commit wrongdoing, to what extent are you held accountable for them, and what is the maximum degree that can be reached in dealing with them, taking into account the elder brother and the father, and regarding songs, TV series, and the conditions of hijab?

Your duty towards your family is to invite them to Allah and to adhere to His boundaries, to denounce their wrongdoings and their laxity in obligations, and to clarify the Islamic ruling with gentleness and leniency, especially with your father, avoiding harshness towards him. If you do this, there is no harm in dealing with your family and maintaining ties with them, provided you avoid forbidden acts and do not participate in them. Maintaining kinship ties is obligatory and is not nullified by sins, as indicated by the hadith of Asma bint Abi Bakr (may Allah be pleased with her) concerning her polytheist mother. As for shunning those who commit sins, it is permissible if it is certain or highly probable that it will be more beneficial for the shunned person. If you fulfill your duty of denouncing evil and abstaining from it, their actions will not harm you, as Allah Almighty says: "O you who have believed, upon you is [responsibility for] yourselves. Those who have erred will not harm you when you have been guided," and His saying: "And there is no accountability upon those who fear Allah concerning their account at all." And be diligent in supplicating for their guidance.