All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Obedience to parents is one of the most important obligations that Allah, The Great and Almighty, has ordained.
Allah Says (what means): {And your Lord has decreed that you worship none but Him. And that you be dutiful to your parents…} [Quran 17:23]
But, such an obedience is confined to what is permissible and reasonable (and all that is good). The Prophet said: “Obedience is but in what is permissible.”
So, if a wife has an upright behavior and has begotten children from this husband and if the request of his father/mother or both to divorce her is just for something in themselves, then he is not obliged to divorce her.
In other words, he is not forced to obey them in such a case. This is the opinion of Imam Ahmad and others.
Moreover, Shaykh Ibn Taymiyyah while answering a person concerning his mother's request who hates his wife if it is permissible to divorce her, said: “It is unlawful to divorce her for his mother's request, although he has to be thankful to his mother, but such a request does not constitute a form of filial piety.”
Thus, you have to be grateful to your mother as much as you can, keep your wife to yourself, and then try to make peace between them all.
For more benefit on the limits of obedience to parents, please refer to Fataawa 271255, 131695, and 123554.
Allah knows best.