Fasting the Six Days of Shawwāl before making Qadā of the days missed in Ramadān

Question: Is it legislated to fast the six days of Shawwāl before making Qadā of the missed days for the one who has days from Ramadhan to make up? Some people allow it saying that A’ishah (radiyallāhu ‘anhā) did not make up the days she missed of Ramadhan until Sha’bān, in the month before the next Ramadān ― so what is apparent is that she fasted the six days of Shawwāl [before making up the days she missed] due to what is known of her desire to do good deeds.

Answer: In the name of Allaah, Most Merciful, The Bestower of Mercy. May Allaah extol and praise the Messenger in the highest company of Angels ―and likewise, his family, his Companions and whoever is guided by his guidance.

What is apparent in this affair is that it is not allowed to fast the Sunnah (nafal) fasts before the obligatory fasts due to two reasons:

Keeping The Ties With Your Father After His Death

The Messenger of Allāh ﷺ said:

“Whoever loves to keep the ties of kinship with his father while his father is in his grave, let him keep the ties of kinship with his father’s brothers after his death.”

[Sahīh Al-Jām’I #5960]