Mami's feelings for Kazuya are not explicitly stated in the Tekken series.
Mami is a supporting character in the franchise, and her primary focus is on her role as the leader of the Mishima Zaibatsu, a powerful corporation, and her relationship with her son, Heihachi.
While her interactions with Kazuya are limited, she has shown concern for his well-being, particularly after his defeat by Heihachi.
However, it's important to note that Mami's actions could be interpreted as a mother's protective instincts towards her son rather than romantic feelings.
The Tekken series primarily focuses on the complex family dynamics of the Mishima clan, with love and romance playing a secondary role.
As a result, it's difficult to definitively say whether Mami harbors romantic feelings for Kazuya.