IME BA crews tend to absolutely excel when you are travelling F/J with kids.
We recently flew MIA-LHR with our two kids (8/9) in F and they were really well looked after throughout. They were given a (discrete) tour of the galleys & upper deck while their dinner was cooking and then when they woke in the morning they crew offered to bring them up to the flight deck when we landed and took lots of photos for them on our ipad. A golden ticket gladly issued to the three ladies looking after us so well.
As someone who is lucky enough to travel so frequently in LH F that it becomes routine - seeing the whole experience again through my kids eyes really recharges my BA batteries and reminds me of the strengths of BA (i.e. their crews) every time the kids travel.
I've had a whole range of BA crews from mediocre to exceptional, but the average is definitely closer to being exceptional when the kids are with me.
As an aside, I would recommend the one of the parents visit the galley before meals time so they can "de-sugar" the kids special meals before they are brought out. The meals were fine but had multiple snacks / treats that were donated to the Club Kitchen as a kid with a sugar high is the last thing you need on an overnight flight at bedtime!