What is the difference between "sind" and "seid" ???

why do you use ihre, why not sie? also why ihre not ihr?

Because "sie" is "she" or "they", not "her". "She daughters are young" doesn't make sense.

Ihre is "her" or "their" depending on context and is basically the possessive form of "sie". If "sie" owns something, it is "ihre". However even the word "ihre" has different forms I think, and unfortunately, like you, I am also learning and don't know all the forms yet. Es ist nicht einfach, aber ich lerne seit zehn Monaten.

Nett.

How are we supposed to differentiate formal to informal and plural to singular "you" when to translate from english to german? This is ridiculous.