I would say the mother was the one with whom he had a poor relationship.
Again, during his Kingdom Hearts "review," he mostly talks about how he had a great time with his dad and had a lot of fun.
However, he barely talks about his mom.
This was very noticeable around 3:00 on the video, where he began to talk about all the rides he would spend with his dad but not his mom.
This also explains why SaberSparks defended Turning Red.
You know, the movie about 9/11.
He really tried to defend that tone-deaf piece of shit because, just like Mei and the creator of that film, he more than likely hates his mom.