My daughter is 10 and I don't watch "cops" with her. She gets ideas, and its not really child appropriate.
I'm probably going to get alot of flack for the following, but as a pro legalization advocate, I feel like I should point some things out...
Marijuana is literally a signature away from becoming legal and decriminalized. And I firmly believe Obama is going to provide that signature, as soon as he straightens out the rest of this country's mess. (as in its not his first or 5th priority, but he WILL get to it.)
And furthermore, "weed" is not at all disrupting your ex's ability to parent, or care for her children. As a matter of fact, it might even help in that she might be calmer, and prepare better meals more often. It has that effect. It is less damaging then alcohol, and with alittle openmindedness, America will see its error and embrace its various and medically valid uses, as well as tax the heck out of it in order to provide Americans with total medical coverage.
It really sounds to me like you are allowing your 7 yr old and 5 year old dictate to you what they "want" and I hate to point this out, but they may just be saying some things like that to you in order to gain your approval or get a reaction from you, also kids are notorious liars, embellisher's, and hate punishment and discipline period. Don't think for one minit they don't need boundaries and discipline, so be happy they are not being spoiled silly.
The best thing in my point of view, which in this case is not a legal point of view is continue with your order of visitation, Don't stir up trouble over anything less then a raging crack addiction, and try to appear supportive of your ex and her family. Your children are lucky to have so many family members involved in their lives, and as long as you are united with them from the beginning, the less chance your children will try to manipulate you and walk all over you in the future.
Speak to your ex about your concerns, try to refrain from being judgmental and accusatory, Your in it for the long haul with her... get it straight asap.