My sister took children from her first marriage and her partners children to visit the partner who was working in Oman for 6 months. They lived together. My sister had reverted to her maiden name, so 3 surnames.
No problems on the way out but on the way back?. The youngest didn’t help. He is autistic and in a total strop, he was 9, he announced that he hated myDS and was not going home
with her, luckily the officer believed sister and the other children. She and the children’s father now share the same name and are old enough to travel on their own.
Get everything in place before you go is my advice.