Seeking Recommendations: Family Law Attorneys across the US (Child Custody)

Hello,

Summary of the issue: I am assisting individuals who are navigating complex, multi-state child custody disputes. The parents reside in different US states, which has created confusion regarding where the cases should actually be filed and how to proceed legally.

Direct legal questions:

1. Under the Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA), what are the strict legal criteria for determining the "home state" of a child if the child has recently moved between states?
2. When evaluating legal counsel for multi-state custody battles, are there specific state-to-state reciprocal certifications, jurisdictional privileges, or specific legal specializations we should be verifying before retaining an attorney?

Thank you for your legal insights.