A pious person once told me this key of improving relationships with everyone I am related to. He shared with me the following, which is a mafhoom of either Quranic verse or hadith ( I don’t remember exactly).
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" IF you do something to please your beloved person but make Allah (s.w.t) unhappy, then Allah (s.w.t) would put your hatred in that person’s heart. BUT if you do something that pleases Allah (s.w.t) but makes your beloved person unhappy (at that moment) Allah (s.w.t) would put your love in that person’s heart (with time) "
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I swear by Allah (s.w.t) this formula helped me all these years in improving my relationship with all the people I am related to. Alhamdulillah, By the grace of Allah (s.w.t) very rarely a bad taste develops between me and my wife, but whenever it develops with no apparent reason in our minds, it is mostly very easy to locate the core problem., i,e. SOMETHING is consistently being allowed to happen in our house that is disliked by Allah and the Prophet (s.w.t) and we both are equally responsible for it. The moment we solve the issue, Allah blesses our relationship with unimaginable sweet taste which we can feel in our hearts.(Alhamdulillah)
It can be anything, like missing of namaz, both of us forgetting (or being lazy) to do something which we are Islamically ordered to do…etc.
The key to success in a relationship is to always encourage each others of morally good acts and discourage bad actions. Be thankful and contented for what you are blessed with and always become yourself the practical example of how you want your beloved ones to become.