Possesion and Adj Agreement

Question

Just checking: In looking at the sentence, "Écoutez cette conversation entre Marc et son amie Lola." It is son becuase it is his meaning Marc's friend, but amie becuase Lola is feminine correct? So, if I say "Ma meuillere amie est Laura.  I use ma because I am female and meuillere amie because Laura is female. I could also say "Mon meuilleur ami, Charles."

Accepted Answer

Elizabeth, see the attached lessons covering your questions. 
It is "son amie" because of the special case that occurs when a vowel (or h muet) follows the possessive adjective, which results in a change of the possessive adjective form in the feminine singular. 
It would be 
1. 'mon amie' and 'ma meilleure amie' for ‘my’ female friend 
and 
2. ' mon ami' and 'mon meilleur ami' for ‘my‘ male friend, 
regardless of your gender as the 'possessor'.
 https://progress.lawlessfrench.com/revision/grammar/use-mon-not-ma-with-feminine-nouns-starting-with-a-vowel-or-mute-h-possessive-adjectives 
https://progress.lawlessfrench.com/revision/grammar/common-mistakes-with-mon-ma-mes-ton-ta-tes-and-son-sa-ses-possessive-adjectives