Guest stars in the same residence have very low quality
When a streamer hosts a guest star who is on their same connection the video quality is extremely low for that guest star, while on the guest star's own channel the video quality is fine. See here starting around the 3hr30m mark: https://www.twitch.tv/videos/1906948974
TheStreamerOfOz joins in and has terrible video quality.
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SiriusDarkblaze
commented
I will point out that the amount of data sent and received by each streamer will compete for the internet priority, the one that has been using it for longer will get priority. On gigabit internet or higher it shouldn't be an issue unless your ISP causes the issues but you would need gigabit or better to make sure quality is stable for both when in the same household, or dual internet services for each streamer.