Can a gift be given to a person who is not part of the heirs?

Gifts given during one’s final illness (The final illness is that in which it is thought most likely that the individual will die as a result of it ) come under the ruling on bequests and can only be given from one-third of the wealth. But it is not permissible to make a bequest to an heir, because the Prophet (blessings and peace of Allah be upon him) said: “Allah has given each person who has rights his rights, and there is no bequest to an heir.” Abu Dawood
If the father/mother is sick but it is not a final illness, then there is nothing wrong with distributing the estate before death, especially as this will prevent disputes in the future.