F can be a "latent" trait, even when dominant. I've met some pretty flinty INFJs who masquerade as Ts in their manner and speech, but underneath you see intense flickers of heat, like the volcano has a cap on it. Conversely, my INTJ best friend is cool-headed and does not express the same F-fire, even when impassioned about something. I frequently sound like a T when I talk, but when you set me next to my INTJ or ENTJ best friends, it becomes very clear where I draw my energy from (and it's not objective logic at all).
I took Sr. to be an ESTJ/P. Jr. is a little more puzzling, as he's always feinting and dodging his father. An ISxx, at any rate.