thanks for your question.
I assume by consensus sequence for a family you mean the emitted
sequence of a family's HMM. If you want that information, you can
just download a family HMM and use "hmmemit" from the HMMer
software package to emit a consensus sequence.
Alternatively, you can download either the protein or CDS alignment
and use BioPerl to get the consensus sequence (http://www.bioperl.org/wiki/HOWTO:AlignIO_and_SimpleAlign)