Finger foods at 8 months and the grandparents are horrified

Our paediatrician said we can start soft finger foods now, steamed carrot, banana pieces, that kind of thing. First try, she gagged a little on the banana, coughed it out and carried on eating. Totally fine. The grandparents were there that day. Ab unka kehna hai no pieces till one year, sirf khichdi mash karke. They help us three days a week so I can't exactly ignore it. Anyone been through this? How did you get everyone on the same page without a fight every lunch?