Grandparent has put themselves down as primary carer on our holiday booking?

[KSM123]

We have a holiday planned with my in laws with our baby who will be 4 months old at time of travel. My FIL has booked the flights and has today told us that he put himself down as my baby’s primary carer. This instantly made me feel a certain kind of way - maybe hurt and a bit angry - but I wasn’t sure at the time if I was being unreasonable so kept quiet…my understanding is that, with this, baby will need to sit with him on a different row from us for the flight when seatbelts light is on. He will also get her extra 10kg luggage allowance. Technically he will also be responsible for any decisions made for her during the airport and flight should something happen?
I am really not sure why he has put himself down instead of myself or my husband. Am I overthinking it? Maybe it’s not a big deal? I just want to be with my baby through the flight and wish it wasn’t so casually assumed that would be ok with us.
My husband doesn’t seem to care and thinks we will be able to just switch seats so we can be on the row with her but I’m not sure it’s that simple if the flight booking has been made that way.
AIBU?

God, same!

Jesus

And ultimately, what does it really matter.
Just sit with your baby if that's what you want to do.

The matter was whether or not I would be allowed to sit with my baby if I wasn’t assigned with her, without there being any hassle caused due to the paperwork. That was the whole point of the post!

RE enjoying the “break” - sounds amazing in theory, but it’s not really a break if you can hear your baby in distress with somebody else and you can’t comfort them.

It depends on the airline

Eh? In dozens of flights to nearly every continent with infants, I’ve never come across this. He’s probably just put himself down as lead passenger which has nothing to do with being actually responsible for the baby.

I don't think the airline will be happy with this scenario when they realise you're on the flight too. It will be obvious you're the Mum at every stage of the process. I suspect he thinks it comes with an extra baggage allowance and leg room totally forgetting that baby's poop and need feeding on flights. I think you might suddenly mention breastfeeding even if you don't!

The airline won’t care whose lap the baby is sitting on. Op can swap seats with her fil and sit there with the baby.

I've not read quite all of the comments but it sounds like you will be ok in terms of not having your (still tiny) baby kept away from you on the plane, but what sort of over-entitled asshole does this?! Expecting to keep a 4 month old baby away from its mummy on what i presume is baby's 1st flight?!

I know your baby is still only very little but does PIL or MIL have form already for being overbearing? Taking baby out of your arms when baby cries because baby needs a 'grandparent cuddle'? You're still learning the ropes, be prepared to be firm and stand your ground. Set boundaries and don't let your PIL ride roughshod over you. They might have paid for a holiday for you but that doesn't entitle them to your baby.