How can I sync S Planner with my wife's phone?

[Paul Bassett]

Syncing S Planner with my wife's phone

I have the Galaxy S5 and my wife has the Galaxy S6. Is there a way to sync the S Planner on them both.
I added my Gmail account to hers but then all my contacts and emails were showing up on her phone.
The only thing we want is when one of us adds something to our S Planner it shows up on the others. We don't need to share contacts, emails or anything of that nature.
If we can't do that with S Planner what would the best Calendar App be to do this.

Thanks