I have a Google home a Google mini and several Pixel phones in my house. My ISY is linked up and working great with Google. My question is if my son wants to use the google assistant on his phone, how do I link the ISY with his Google account as well as mine? 

Create a sub account on the Portal for your Son.

Have your Son separately add the ISY Home Automation solution to his Google account, and use his sub account to link the Portal.

 

He can then manage his own spoken commands to operate your ISY solution.

Thank you for the help. 

 

I created him a user on the ISYportal, but don't see how he can add his own spoken commands? 

ApoLogies, I was mistaken.

 

Each Portal account has one set of spoken, each user on the account shares spokens.

 

However, your Son should be able to link to the Portal now using their own Portal account. Make sure the default ISY is set correctly though.

Worked out well. Thank you