@Helen *******
as this is brand new for all.
Did you apply at the same time ?
or has the primary already obtained the visa?
In some visas the primary obtains theirs first, then the dependants apply with the appropriate documentation, proof of relationship, visa etc.
If you all applied at once I wonder if that may be why.
No Thai dependant visas require funds, as per BKK this is the same.
I asked this exact question and was answered 500k per family NOT per applicant.
I hope that they are able to sort it out, for many that would be a deterrent.
Just to note, this was asked during an official immigration information program.