The way these girls acted, thinking they could face Daniel in any situation, was honestly foolish. Of course, they probably knew that themselves.
The only thing they wanted was to fight him, because they knew every time they sparred with him, they could figure out their weaknesses faster.
Someone like Alice preferred to speak indirectly, throwing in extra words to try and push her brother to take things more seriously.
But Tiana was more straightforward. She didn't really care, and if it wasn't for Alice, she would've just directly asked Daniel to spar and point out her flaws.
Daniel could easily read his sisters' minds, so he didn't say anything and simply went along with them. While mocking them a little, of course, he was still teaching them.
On the other hand, both of them saw Daniel as their role model , the goal they wanted to reach. More than anything else, they wanted to stand in the same league as him, stand by his side, and help him.
