You should advise your brothers not to sell
tobacco and obscene magazines, because such things are unlawful and entail Haram earnings. It is not permissible to deal with those who sell such things, for Allah (Glorified be He) says:
Help you one another in Al-Birr and At-Taqwâ (virtue, righteousness and piety); but do not help one another in sin and transgression. And fear Allâh. Verily, Allâh is Severe in punishment.
You should seek the help (Part No. 13; Page No. 59) of the righteous people from your relatives to advise your brothers until they consent to stop selling these things, if Allah wills, in sha’a-Allah. We ask Allah (Exalted be He) to guide them to the path of Al-Haqq (the Truth), and guide us all to what pleases Him. However, if they refuse the advice, then you should break up with them and save yourself from Haram earnings and cooperating in sin and aggression, even if this is against the will of your mother. The Prophet (peace be upon him) said:
Submission is obligatory only in what is good (and reasonable).
He (peace be upon him) also said:
There is no submission to a creature in matters involving disobedience to Allah.
At the same time, you should be keen on seeking every way to please her as long as they are lawful and permissible. We ask Allah (Exalted be He) to grant you success, and guide your brothers to that which is good. May Allah guide and grant us all a good end.
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.