Just making sure I understand:
Your exes are both friends with each other, work together, and they have kids "together" (meaning that their kids are siblings, even though they're not together/together).
Honey... You're screwed.
At this point you're fighting a rear-guard action. Pick your battles very VERY carefully. As in, pick ones that you can win, and pick ones that you are *unwilling* to lose at any cost.
While I'm with you on inappropriate gifts, I can see why "no gift for 1 child" would be completely ignored. If he's giving gifts to all the other children, if he doesn't want to actively HURT the one child that isn't his, as well as make his own children sad/upset with him that their brother didn't get anything... he needs to pony up for that child as well.
How I would suggest changing this into a battle you CAN win:
- Toys given by each parent need to stay at that parent's house. Since he's not the parent of one of the children, toys given by him need to stay at dad's house if they're not approved by mom, or at his house.
OR
- Take unapproved toys home, so that you can set the limits on it that you see fit.