when ever my family comes they never really bother me about playing a song EXCEPT for my grandparents...they always want me to play somthing or when im at a friends house his mom likes to hear me to play this spanish piece or somthing...
Usually for my grandparents I just pull out some bach piece or travis pick the C, G, D chords into some sort of melody since they wont want to hear a massive solo..which is cool and all
my "step" grandparents if thts what you want to call them usually want me to play somthing but im either A) to nervouse or tired or B) have forgoten the song i was gonna play