Ex Brought Sibling's Daughter For The Dna Test In Our Paternity/custody Battle. What Happens Now?

Our family has been alternatingly extorted or ignored by a woman (we'll call Ex) who my relative (we'll call Bob) dated and possibly impregnated. The saga is inordinately complicated, with multiple children and baby daddies floating around, so I will just give the basics and most recent developments.

Bob is a sweet guy but hapless. He learned that he maybe impregnated Ex toward the tail end of their on-and-off again situationship. Bob does not want to be a deadbeat dad. So Bob got the court to order a paternity test for Ex's kid. There have been multiple tests so far. The tests have been bizarrely slow and confusing -- I guess that's the norm for family court, but wow. One test was "inconclusive". One test suggested that Ex was not the mother of the child tested (!!!), so another test was ordered. In-person testing has included a photo of the child (low quality, overexposed) , I guess to help with identifying her. As Bob has been prevented from seeing or interacting with his possible child, the photos have been unhelpful... until the third and most recent test last week. Bob hired a private investigator to tail Ex to and from the testing appointment. This PI got some bizarre footage.

(1) The child has on huge noise canceling headphones and is iPad'd up the entire time they're in the testing building and when Ex is talking with her parents. As soon as they're clear of the testing center they take the headphones off and the child doesn't have them on for the rest of the day, including other car rides and on other errands.

(2) Lots of footage of Ex and her sister swapping their several children (who are the same gender and the same age) around in ways that don't make sense. The child Ex brought to the DNA test appointment quickly ends up back at Ex's sister's house, with Ex's sister's children, and does not return to Ex for the end of the day.

(3) The child brought for testing clearly calls Ex's sister "mommy" (not Ex, who was not even there at that point). I've seen the footage, it is super clear -- Little girl looks right at Ex's sister, is waving her over for attention, and says "Mommy!". Yeah. The kid Ex brought for the DNA test, ostensibly her own child, gets dropped back off at her sister's house, where she then calls her sister Mommy. KIND OF DAMNING?

TLDR: Instead of bringing the little girl (3F) that is the actual subject of the paternity/custody dispute we are currently embroiled in, Ex appears to have brought her sister's child that is the same age.

So... what happens now? Is it illegal to bring the wrong kid for a paternity test? I assume so, but under what statute? What is the penalty?

Bob has been deeply distressed by these events, has spent tens of thousands of dollars on legal fees and has been profoundly clinically depressed during this entire process. Can he sue for Ex to cover his legal fees? For emotional distress caused by her stretching out this process and blocking and delaying it at every turn, and for not even bringing in the right kid for these tests?

What else should Bob ask his lawyers? Remember, I said Bob is hapless -- he is funny and empathetic and kind but also incredibly shy and easily overwhelmed. He needs extra guidance on what to ask and what to fight for or he rolls over.

Why did Ex think she could get away with child-swapping for a DNA test? Shit, why did she almost get away with it? There's supposedly a guardian at litem appointed by the court who would have been around for these tests... did no one really ask the child "Hey, can you tell me who brought you here today?" or "Can you tell me about the people in your family?" Headphones really won her the day? HOW DOES THIS HAPPEN?

We are in Connecticut. I am a close relative of Bob. I would love thoughts and ideas. Anything could help. Thank you!