Married couple living in different states how do we file with a dependent

[Netty2015]

I live in MO with our child and my spouse lives in CA.  My child and I spent about 2.5 months visiting in CA. How should we file our federal and state taxes

[tagteam]

See https://ttlc.intuit.com/community/taxes/discussion/married-and-living-in-different-states/00/3104099