Parent asks child to divorce spouse:
If a parent requests of their son to divorce his wife he is not obligated to listen to them. If however, the wife is evil and causes pain to her husband and his parents, then it is a mitzvah to listen to their request and divorce her. Likewise, if the wife desires a divorce and the parents asked the son to give her a divorce in or to avoid a fight, then some rule that it is a mitzvah to listen to them.
 See Encyclopedia Talmudit ibid p. 408 footnote 499-502
 Sefer Chassidim 561
 Tashbeitz 1:1