The easier way would be to do this:
This is Python compatible code, and lets you expand the code later on, but I don't know if it's possible, I haven't tested this is RenPy.
Code:
if Joa < 5 and Smi < 5:
menu:
"Steak"
else:
menu:
if Joa >= 5:
"Joan"
call JoanDream
if Smi >=5:
"Mrs. Smith"
call SmithDream