It seems this post contains questions on two different topics. I am asing about how to know this is vosotros rather than ustedes. I see the question

Question

It seems this post contains questions on two different topics.  I am asking how to know to use the vosotros form of ver rather than the ustedes form when asking about checking on piglets, which sounds completely lovely to me :-)

Silvia Píriz · Accepted Answer

Hola Anna T.
In Spain, vosotros is used when addressing a group of people informally, while ustedes is used for a group in formal situations.
So, if the context suggests you’re speaking informally to several people, vosotros is the appropriate form. In most of Latin America, ustedes is used for both formal and informal plural “you”.
I hope this helps!
Silvia

John O'Leary · Answer

I love this discussion. Silvia is (of course) spot on. Piglets are totally cool and deserve to be spoken of in familiar terms. It has been said that dogs want your approval, cats think they are better than you, and pigs see themselves as equals. I think all of that is true.  So where piglets are concerned, if I were raising them I would use vosotros. I’m sure a butcher might prefer Ustedes

Anna Torres · Answer

Thank you John and Silvia!  Now I know!