I wrote "la mia sorella grande spesso beve il te con latte'" and "la" is given back as not being correct here. Why is that?
When using a possessive pronoun with unmodified close relatives in the singular, the article must be omitted, and sorella is among those words. However, the adjective grande modifies sorella, so the article should be allowed.
So this is a rule which applies specifically to close relatives? agggh! Italiano!!!