Hing dai - the hing is the same hing in sihing (兄) which means elder brother. The dai means 'big' (大), which adds more respect to the term. Sometimes you might hear it as dai sihing. The meaning is more or less the same.

Simu - the mu, usually pronounced mou in Cantonese (母), means mother. This is the term you use to address the wife of your Sifu. However, a female Sifu is still addresses as Sifu, not Simou. Her husband is also addresses as Sifu. I think that's a Confucian thing.