In essence they have the same spirit as the TFP.
Tradition Family Property irks me. If you get on their books they pester you sending "gifts" and other fundraising stunts.
But I find Tradition In Action is full of useful information which I can take or leave. For me it is worth the taking. They have some very astute and well informed writers. And their graphics are great!
My understanding is that TIA is a breakaway from TFP and a return to the original mission of the founder.
You have to recognize where they came from. The turmoil of
Vat.II caused a lot of interference with the normal practice of
the Faith in those days, and the TFP under Prof. Plinio was one
of the casualties. The difference is, while most groups caved
in to the Newmass and Vat.II and Newsacraments, that was not
the bent of Prof. Plinio, although he did not survive long enough
to make his true direction clear. However, his right hand man,
Atila Sinke-Guimaraes, did everything he could to keep all the
kittens in the basket. He built up his readership one by one,
with very personal attention.
TIA has nothing to do with TFP, even though Marian Horvat's
own brother (John) is one of the leaders of TFP.
The really sad part is that here in a metropolis of 15 million
people, hardly anyone is around to make some semblance of a
community with them. It's really sad. They are loyal to the
Canonized Traditional Latin Mass and pray and sacrifice for the
restoration of the Church. And still it's taking FOREVER.