If any of these cells have text in them put a comma, if there is no text then a comma

I have an extremely long formula and I need to list the family members like so.

Person lives with PARENT 1 CELL (PARENT1 NAME CELL, PARENT1 AGE CELL)

Then it gets trickier because there are 4 more sets (relation, name, age) to account for other family members. If ANY of these cells have information in them there should be a comma afterwards [i.e., (PARENT1 NAME CELL, PARENT1 AGE CELL), ]. If NONE of these cells have any information in them there should be a period.

&IF('Qualtrics Output'!BD3, 'Qualtrics Output'!BG3, 'Qualtrics Output'!BJ3, 'Qualtrics Output'!BM3="",”.”,”,”) is not how to do it...
All the referenced cells are names btw.