Great story and good for the FA to stick to what is right.
Now, I may have a similar situation coming up.
Soon, my wife, me, and a new born (no seat) will be on F. My 3 year old daughter will be on J with her own seat with grandpa and grandma.
Being only 3-year old, I think she will be on our laps most of the time anyway. In addition, she is a daddy-girl and will go where I go
. I am not sure if she will stay in J with grandma while I seat in F.
I am hoping the FA will allow her to seat at F with me during the flight. Do you think that is possible?
Anyway, I am prepare to switch seat with one of the grandparent and seat with her in J.