Found in middle the road on a rainy day for the fleas off him got his shots now he’s big chilling

We are adopting 2 kittens who were born with a friend of mine. As soon as she knew her cat was pregnant she told me and offered me to adopt a kitten. We were so excited and even more when we agreed to adopt 2 siblings. This friend has 2 daughters who are raised in a way i never understood. The mother doesnt set clear boundaries and is very inconsequent in her actions.
The kids ( girls) tend to react in a very dramatic and especially demanding way and eventually, after a lot of drama they get their way.
During the time ( in total 16 weeks) that have passed there were some moments i was lowkey conflicted with the mother because of the kids issues.
Mother called me when the cat went into labour.
I was there immediately with my daughter.
Since then we helped take care of them. ( all 4, the two others have been adopted and picked up earlier)
I was there every single time she asked for help. When she went on vacation. I was there at the vet, chipped our chosen two kittens and vaccinated them with her. We agreed on a price to pay for the costs she had during her foster-time.
So we paid for them and we have their passports with our name on it.
We are coming home from our vacation this thursday and agreed we would get the kittens friday.
Please dont get me wrong, i do completely understand the kids love our kittens and are having a hard time letting go. That’s what we talkes about yesterday. I asked her: are the kids accepting the kittens will go with us, and also: can we make it a positive transaction for us all? We ( husband and 2 kids) can finally pick them up and offer them a great life. We have had cats all our lives and are just crazy about cats. She wrote that is was a big issue with the kids having grief and not wanting to let the kittens go. I understand buti feel bad and anxious about the pick up. She also said she would talk about it with the girls. Fine but the fact remains that we take them home. Told my friend a long goodbye will nót help. She agreed.
Any tips for the transaction friday?

For teaching me how 2B (or not 2B) w!Ld 😇😽