We do know that this is true, because it's something Alex has talked about herself. She won't let her carers wear gloves.
She's posted quite a few pictures and videos of Ari in her Instagram stories. She also added a new Instagram grid post featuring Ari:
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With these comments from Alex herself:
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Here's the video, which features Alex giving Ari lemon water sucked up from her own straw:
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And Alex posted this in her stories:
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NOAH WATCH: he hasn't been visible in anything for a while now. The last time I remember seeing him was when he was holding the cup of corn in the park (and there was no way to know if that was current). Alex and Salina have mutually unfollowed each other, and Salina has also unfollowed Noah. However, he hasn't unfollowed her, which may suggest that he currently does not have access to his social media accounts.