As a formal matter, IF they'd filed oppositions (which they did not) to Baez's motion, then they would sit alongside the prosecution/SA.
If an interested party's counsel is present in court, but did not file nor oppose any particular motion, they can pretty much sit where they like (no specific rules.) A more "neutral" spot would have been in the bench or in a jurors' seat (commonly done, too.)
I find the fact that Brad Conway waived any conflict of interest re: Mark Nejame, who'd at one time represented the Anthony family, and who now represents TES, together with the fact that both he and Mark Nejame sat with the SA, to be very interesting for the following reasons:
(1) as a procedural matter, waivers of conflict are usually handled privately, behind closed doors between the parties affected by any such conflict (usually in writing, too. My state requires that any such waiver be reduced to writing and signed by all parties to said waiver + their counsel,) and
(2) one would expect that if the Anthony family were really "standing behind Casey and supporting her 100%", etc., they would not agree to such a public waiver, so this has me laughing about Brad Conway's in court statement to Casey that her parents supported her, yadda, yadda.