OP has asked this same question 4 times in slightly different manners, slightly different facts or lack thereof, one of the children is a step child, so the answer is still the same as
https://forum.freeadvice.com/showthread.php?t=295239
that he can take his bio child on vacation but not his stepchild. If you plan to take your child/ children on vacation out of state it is advisable to have permission from the other parent and also to have child custody orders even though you are in the proces of divorce.