[jpfarb21]

He is very unstable and mostly likely using and selling drugs. He leaves our children with family on his custody days. He sends harassing phone calls and harassing emails.

[cdad]

If you think he is on drugs then get the courts to order a drug test. If it comes back positive then take appropriate actions.

[N0help4u]

You can also try and prove he is an unfit father if you have enough evidence.