@brummiesue
YANBU. I think the couple were out of order, and they should have been made to move. People don't deserve more respect or special treatment just because they are 'seniors.' Respect is EARNED, and you don't just get to demand it because you're over 60! And it's not AGEIST to call people OLD; it's just part of their description FFS!
Howeverrrrrrrrr..This woman lost all my sympathy by taking their photo, (and plastering it all over the place, and blabbing what happened all over the internet/social media.) It's pathetic, childish, and attention-seeking at best; nasty, vindictive, and BULLYING behaviour at worst.
Some people on the internet are horrible, and could potentially make this couple's life a misery. No-one else needed to know about this. NO-ONE.
Me personally, I would have asked them to move, and told the conductor if they said no, and happily have taken the seats the conductor found me. On the way out, I would have said 'I hope someone does the same to YOU' to the couple!
And that would have been it.
Shaming the couple by plastering their faces online is disgusting behaviour, and makes the woman look like a nasty vindictive spiteful cow to be honest.
And the kids 'sad faces' for the purposes of trying to get pity is fucking pathetic. That woman (the mother of the children) should be ashamed of herself.