'The best (most pure) food a man consumes is that which he has earned himself, and his child (and his child's wealth) is part of his earnings." (Using translation from Ibn Mājah 2137)
قَالَ رَسُولُ اللهِ ﷺ إِنَّ أَطْيَبَ مَا أَكَلَ الرَّجُلُ مِنْ كَسْبِهِ وَوَلَدُهُ مِنْ كَسْبِهِ