No.
Actually, you find out in episode 41 that Yoh actually isHao's human half. If you need proof, look it up on Wikipedia. Click Yoh Asakura, then scroll down until there is a blue link saying Hao Asakura. Read until you have your answer.
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Yes he sliced Hao in half using the kili kili power Oversoul
Oh yeah Zeke is Yoh's twin brother. Zeke is really old but he somehow gets Inside Yoh's mom and be comes Yoh's twin. In the series Zeke's name is Hao.
No, but Hao ( or Zeke ) did feel something to Anna, whilst Anna wa in love with Yoh Asakura ( Hao/Zeke 's brother )
Yoh Asakura is 14-15 years old.
Probably in a sisterly/friendly way. However, Asakura Yoh is in love with Anna in the series.