Is it permissible to bequeath the entire estate to the children only?

This will is invalid and impermissible, as it is a will made to an heir, and this has been forbidden, as the Prophet, peace and blessings be upon him, said: "Indeed, Allah has given every rightful person his right, so there is no will for an heir." Moreover, it is an objection to Allah's law and an overstepping of His boundaries. Whoever does this has incurred Allah's wrath and painful punishment and will enter the Fire, for the Prophet, peace and blessings be upon him, said: "Indeed, a man and a woman may spend sixty years in obedience to Allah, then death approaches them, and they harm others in their will, so the Fire becomes incumbent upon them." Therefore, it is obligatory to fear Allah and follow His command.