@coldinfluencerbeliever replied:
IIRC was mentioned in the first few chapters that Tatsuki's mom cooked food that Tatsuki brought over for Orihime.
This isn’t in the manga but is in episode 2 (at about 15:59 or so) to explain the meal Tatsuki and Orihime are having in chapters 3 and 4. While checking the manga I did find some other interesting things! First, most dully, in chapter 425:
Tatsuki confirms it’s her family’s dōjō by using “our” to describe it. But we knew that already and that’s pretty boring. However, chapter 24 tells us something much more exciting:
Tatsuki says in the second speech bubble: あたしん家どうせ今晩誰も帰つてこないんだし.
The first four characters here, あたしん, are an abbreviated, colloquial, feminine way of saying アタシンチ, which indeed means “my family” (as we also see with say, this manga). The net effect is something like “Nobody in my family is coming home tonight.”
This would be a very weird thing to say for a single parent, or even both parents. You would only be likely to use a phrase like this if there were three or more other people in the household who are not all of the same generation. This suggests that Tatsuki not only lives with both parents, but also with either grandparents, siblings, or both!