I can do the following in Siri:
Remind me to take in the tea in two hours.
In my personal reminder list is Take in the tea with an alarm set for two hours from now.
Add take in the tea to my family list
In my family reminders list (shared between my wife and I) is a reminder to Take in the tea.
What I can’t seem to figure out is how to get Siri to create a reminder to take in the tea with a two hour alarm and put it on my shared family list.