Spouse A is a step parent to Spouse B's children. They also share DC.
A's parents have come into some money recently and have offered to treat A, B and their shared children to a holiday but have suggested B pays for their older children to go (A's stepchildren).
A's parents don't have much if any relationship with the stepchildren and they are now teens.
A doesn't see the problem and refuses to bring it up with their parents, B thinks it is a problem and they should.
WWYD?