If this is haram money, you must dispose of it in means of charity to cleanse your money and not use it for your benefits.

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Dreadlocks are made of using one own’s hair by twisting and locking them and this is permissible. In case of wudhu, wiping over the head is sufficient, while for ghusl, the water must reach the roots of the hair and your scalp. You say the water reaches the scalp / roots, so this is permissible.

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If you started the prayer while imam was standing, you must complete the Fatiha. Otherwise, your Rakah would not be complete. If the imam raises his head before you go for ruku, this Rakah is void and you must add another Rakah after the imam gives Salam.

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You must not do this and, instead, lead by Islamic examples. This might soften their hearts. About segregation of genders: When they visit your home, they must abide by your rules.

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