Pope Francis doesn’t shy away from a mention of some of the more challenging family relationships, the loved ones of one’s spouse:
198. Finally, we cannot forget that this larger family includes fathers-in-law, mothers-in-law and all the relatives of the couple. One particularly delicate aspect of love is learning not to view these relatives as somehow competitors, threats or intruders. The conjugal union demands respect for their traditions and customs, an effort to understand their language and to refrain from criticism, caring for them and cherishing them while maintaining the legitimate privacy and independence of the couple. Being willing to do so is also an exquisite expression of generous love for one’s spouse.
For your reference, remember that Amoris Laetitia is online here.