Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 1 year ago

If the income of the father is mixed between lawful and unlawful, then it will allowed for his children to take what they need for their lawful needs with the intention of utilizing the lawful part of the income.

If the whole income of the father is Haram (Unlawful), then it becomes forbidden for the grown up (Baligh) children to use such unlawful income.