From experience i'll tell you using kids as a go between is wrong. That being said, I don't see anything wrong with your kids asking mom for some more time with you. Believe me, if they want more time with mom they'll not hesitate to tell you.
If she's pissed then to bad. Spend as much time with them while there young as you can. Mine were 4 and 13 now they are 14 and 23 and being with Dad isn't what it use to be.
Remember never bad mouth there mother and work together when you can. Choose appropriate battles to be fought. Sometimes you will have to take it in the .... to be the PARENT they deserve.
cire
Me 48 X's vary S 27 S 18 Back with high school sweety after 30 years..