Founding fathers only had sons?

In Canada the national anthem is to be amended into gender neutral terms so that “in all thy sons command” becomes “in all of us command”. 

https://www.theguardian.com/world/2016/jun/15/canada-national-anthem-lyrics-gender-neutral-parliament

The Australian national anthem was amended on its adoption in 1984 so that 'Australia's sons let us rejoice' became 'Australians all let us rejoice'. Other changes were made to 'the rarely sung' third verse.

Image from NGV http://www.ngv.vic.gov.au/australianimpressionism/education/insights_historic.html