If I'm not wrong, when asked about that on some interview, he said that no, he didn't want children since he already had his nephew, with whom he was very close.
I'd understand if hide said that just to protect his child, if he had one.
I don't know what's true and what's not, but this is what I remember I've read:
hide had a girlfriend sometime in the 80's and they got married.
They had a son together, they divorced and the girl moved to another country or something,
maybe bringing their son with her?
Anyway, I've also read somewhere that hide never wanted to talk about
his past marriage and all that.
Either these things are just rumors, or they are things that maybe circulated
in japanese media in the 80's?