Well I think you could talk to a lawyer and they could possibly set up some sort of temporary child support through the courts. How and what the process is called varies a bit by where you live. Would require some research.
Or, maybe you try to sit down and have one conversation about a 'budget' or allowance? Then, once that is set up, possibly it happens automatically and next time you talk the subject would be different.
me 41 w43 married 20 years BD 10/10/13 ILYBNILWY.... 4 kids, 21,18,8,6