Their mom Tonya,
Honestly I feel like it obvious that her mom favors Izzy over Kylan. Just given how happy she seems to be in a video with Izzy , rather then Kylan and I don’t have evidence but their mom gives me such a weird vibe especially with the girls self image issues. Like Kylan thinking if she isn’t blonde enough that she’s ugly and down to them editing there photos like both of them are already so skinny they seem to be like a size 0. So the fact that they edit there photos to be even more skinnier is actually insane to me and it makes me wonder what are they being told by their parents.
Also their mom isn’t trust worthy for the simple fact that she put them in pageants when they were like little little kids.