[primuler]

Something interesting was posted in Hata's diary this week.

Spoiler for Spoiler:

EDIT: Musoka said it already, but still.
Hata said the man with cross scar on the forehead is not the Father.
When he designed the character, he added the cross unconsciously so he erased it off afterwards. And the master of cafe Donguri seemed to have caused confusion too, but he is not Hayate's older brother either. What's on his forehead is hair, not scar.
Hata says that Hayate's brother is actually a gorgeous person. He wanted to let him act more, but then again, that would have thinned Hayate so he had to restrain himself.
And the Midas that Hayate's brother brought down is fully-fledged one, so it was very strong.
And it seems that the title of the next week's chapter is 'Bell chime spreads in the future'


So yeah, my guess is that Shiranui is Hayate's brother.