#is like saying your teacher must hate you because they're spending extra time teaching you in a lesson you are *failing*

[mxtxfanatic]

I would also like the mdzs fandom to stop inventing turmoil between Jiang Fengmian and Jiang Yanli just because Jiang Fengmian had a strained relationship with Jiang Cheng. There’s nothing to say that the father-daughter duo had issues, that Jiang Fengmian was neglectful (to either of them, tbh), or that he was indifferent to his daughter's presence. You feeling like Jiang Yanli is disappeared into the background of her family life because she, like her father, doesn't have a lot of scenes is not supported by the canon. While we don’t get a lot of interactions between them (because there is literally no plot or conflict to highlight), what we do get is Jiang Fengmian sticking up for his daughter and terminating a marriage contract that his abusive wife set up, something even Jin Guangshan was afraid to do:

[Jiang Fengmian] told Jin Guangshan, “The engagement was originally made at the insistence of Ah-Li’s mother. I never agreed with it. Given what happened today, it seems both sides aren’t very fond of each other, so it’s best not to force the issue.” Startled, Jin Guangshan hesitated a bit. Regardless of the situation, ending an engagement with a member of another Great Clan was never a good thing. “What do children understand? Let them fight. Fengmian-xiong, we need not take notice.” “Jin-xiong, though we can help them arrange a marriage, we can’t live the marriage for them. In the end, they are the ones who will spend their lives together.” This marriage business wasn’t Jin Guangshan’s idea in the first place either. From the perspective of consolidating power through a marriage alliance, the Yunmeng Jiang Clan would not be his first choice, nor was it the best choice. The engagement had happened only because he was perpetually afraid of opposing his wife. But in any case, since the Jiang Clan had brought it up of their own accord, and Jin Clan was on the male side of the arrangement and thus had fewer things to be concerned about, it was not necessary to remain entangled. Besides, he knew Jin Zixuan wasn’t happy with having Jiang Yanli as his fiancée. After giving it serious consideration, Jin Guangshan found his backbone and he agreed.

—Chapt. 18: Elegance VIII, fanyiyi

We get him hand-making kites with her to decorate for Wei Wuxian, Jiang Cheng, and the rest of the disciples to play with:

Back when Wei Wuxian lived at Lotus Pier, he had played the kite shooting game with the disciples of the Jiang Clan and had placed first many times. ... Jiang Fengmian had constructed the frame himself and Jiang Yanli had drawn the design. Thus, whenever Wei Wuxian and Jiang Cheng had taken their kites out to compete, they had felt a kind of pride.

—Chapt. 32: Morning Dew V, fanyiyi

We get them having family dinners often enough that Wei Wuxian seems worried that he would miss one right before the Wen show up to Lotus Pier:

Wei WuXian asked, “Uncle Jiang went out so early in the morning —why hasn’t he come back yet? Would he make it in time for dinner?”

—Chapt. 57: Poisons, exr

We get him having no qualms with Jiang Yanli's hobbies such as cooking, even seems eager to partake in her creations—if we assume he hasn't before:

With a smile, Jiang YanLi wiped Wei WuXian’s mouth and chin, and walked happily out with the bowl in her hands. Jiang FengMian sat down where she had been sitting. Glancing at the porcelain jar, he seemed as if he wanted to taste it as well, but the bowl had already been taken away by Jiang YanLi.

—Chapt. 56: Poisons, exr

The reason why Jiang Cheng thinks his father hates him is because he takes any whiff of disapproval from his father to mean hatred, a trait he picked up from and that is nourished by his mother's own insistence that Jiang Fengmian "must" hate her son for being like her:

The founder of the YunmengJiang Sect, Jiang Chi, was born a rogue cultivator. The ways of the sect were honest and unrestrained. Madam Yu’s manners were the exact opposite. And, both Jiang Cheng’s looks and personality took after his mother. He hadn’t ever been to Jiang FengMian’s liking. Since birth, he taught him in many ways, yet he still couldn’t change, which was why Jiang FengMian had always seemed as though he didn’t favor him too much.

—Chapt. 56: Poisons, exr

The founding father of the Jiang Clan of Yunmeng, Jiang Chi, came from a knight-errant background. The family was exuberant, honest, magnanimous, and carefree in its ways —all of which were in complete opposition to Madam Yu’s spirit. Jiang Cheng took after his mother in looks and personality, which had never been to Jiang Fengmian’s liking. He had tried to educate Jiang Cheng in a myriad of ways, but it had all been for naught. This was why it always appeared as though he didn’t favor his son.

—Volume 3, Chapt. 12: Sandu: The Three Poisons, 7seas

Notice how it doesn't say that Jiang Cheng, himself, was never to Jiang Fengmian's liking, but that Madam Yu and her personality type that Jiang Cheng inherited was never to his liking, and it only "seemed/appeared" that Jiang Fengmian did not favor his son because he spent a lot of time trying to correct Jiang Cheng's bad habits, something Jiang Cheng resented. Notice how it also does not say that Jiang Fengmian avoided or ignored his son. In fact, we are told that he tried different ways to teach Jiang Cheng, a futile action we see him still committed to even up to the fall of Lotus Pier. Jiang Fengmian never gave up on his son. Jiang Cheng gave up on himself as Jiang Fengmian's son. None of that has to do with how the Jiang Fengmian and Jiang Yanli interacted in life nor how Jiang Yanli felt about her parents in death, still visiting their tablets regularly to clean and talk to them:

Jiang YanLi was kneeling in the ancestral hall. She cleaned her parents’ memorial tablets as she whispered. Wei WuXian poked his head inside, “Shijie? Talking to Uncle Jiang and Madam Yu again?”

—Chapt. 71: Departure, exr

To say that Jiang Fengmian is a terrible father simply because Jiang Cheng is more comfortable believing his mother’s lies than understanding that unconditional love does not mean unconditional tolerance for poor behavior does Jiang Fengmian’s character a disservice. To say that Jiang Fengmian is a terrible father to Jiang Yanli based on Madam Yu and Jiang Cheng’s own fantasies of victimhood is just an extra unnecessary lie to give credence to an idea that the story proves untrue. At worst, Jiang Fengmian was a man reserved in physical displays of affection that could have stood to hug his son more if that was what Jiang Cheng truly wanted. But if we are being truthful, Jiang Fengmian's just a regular fucking guy juggling raising kids and leading a clan with deterring his abusive wife from turning his home into a battlefield any time she deigns to show her face. Whatever issue you think Jiang Yanli and Jiang Cheng should have with their upbringing, the locus of the problem is named Yu Ziyuan, not Jiang Fengmian.