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You could both share one LastPass account and it would work similar to your single spreadsheet, but that is not recommended. You should each have your own account, then use the family system for shared folders of accounts and passwords that both of you use. That’s how Jim and I use it. You sign up for the family plan at $4/mo. That gives you up to 6 licenses – you would only use 2. then you have the ability to set up shared folders – that either of you can add items to and use all items regardless of who added them.
AS for smartphones, you just install the LastPass app (video coming soon) You will have to enter your master password to get it to work. Not every time you use your phone, but often enough. LastPass would send a warning if your account is being used on another device, but if you each have your own account that won’t be an issue.
Let me know if this helps.