'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 اللَّهِ ﷺ «إِنَّ أَحَقَّ مَا يَأْكُلُ الرَّجُلُ مِنْ أَطْيَبِ كَسْبِهِ وَإِنَّ وَلَدَهُ مِنْ أَطْيَبِ كَسْبِهِ»