I have been separated from my ex husband for 2 years, we have an 11 year old son and we have joint custody. I paid for a separation agreement and over the 2 years my ex has taken away or decreased the amount of money that was going to my son that was laid out in the agreement. He has claimed the child tax credit causing my son to lose money from the government as my ex makes more money and my son only gets my portion of the credit 6 months of the year now, he has done the same to the GST credit and has taken 50% of the RESP that he has not contributed to (no proof). Recently he used his RSP that he had when married to me to by a house, this increased his income, but when I challenged to increase the child support, he came back with a lower child support amount than he's paying now because the RSP money is considered off limits due to it being a previous RSP from our marriage. Now he is taking me to court to lower the child support to below poverty. On top of all of this, his girlfriend which he lives with thinks that she has legal rights of my son and she thinks she should be involved in decisions about him. She and I have had confrontations and she wont mind her own business. My ex is spineless and waits for her to get home so she can prepare threatening letters to me, usually threatening to take me to court for issues that could be resolved through communication. I am tired of being bullied and I want some advice on how to get back what my son deserves and how tell her she has no legal rights and to bud out.