The Prohibition - 66:2
Allah has made known to you the way to make your oaths lawful. Allah is your Mawlana (master). He is All-Knowing, All-Wise.
What those who want to return to their wives after alienating them by replacing them with their mothers should do:
The Pleading Woman/58:3
Those who have alienated their wives by likening them to their mothers, then turn back on their word, let them free a slave before they have sexual intercourse with their wives. This is what you are advised. Allah is aware of all that you do.
The Pleading Woman/58:4
Whoever cannot find a slave to free should fast for two consecutive months before sexual intercourse. And he who cannot afford it should feed sixty poor people. You must believe in Allah and His messenger. These are the limits set by Allah. The disbelievers are doomed to a painful punishment.