Tool to export data with all relational data?

In reality, you could just script it yourself using mysqldump.

Here my posts using the --where option for mysqldump:

• Aug 15, 2011 : Is it possible to mysqldump a subset of a database required to reproduce a query?
• Mar 14, 2012 : Can I mysqldump an entire database while using where='condition' on individual tables?
• Jul 15, 2013 : Export just rows modified in last month (date defined by user)

With a good review of your tables and some SQL elbow grease, you can script the dump for any table and its child records with the corresponding foreign key references.

Give it a Try !!!