Website, database, and multiple users

Hey guys I have developed a budgeting app I use for my family. My brother and sisters are interested in using it now. It was previously setup where my wife and I would make changes to one DB and we both have Windows logins with rights to modify the DB. I
am rewriting the ASP.NET web form to implement some new things I have learned.
I now have the ASP.NET web form to register and allow logins, with a SQL database, but my question is, is it recommended to have say, a budget table(in this situation) that has the name of the bill and amount, with a column for the username, that has a foreign
key to the users table in order separate users or should every user have there own DB? Your thoughts?

I would create groups of users I.E. for husband an wife with a numeric key and put that as a foreign key on all budget records. That way you can limit a pages view to only the logged in group id.
Andy Tauber
Data Architect
The Vancouver Clinic
Website | LinkedIn
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