Do I need to contact the Social Security Disability Office to set up an appointment for my children if their father is approved for benefits?

My ex husband has applied for disability benefits in the last year or so and stated to me the children will receive a check within a few weeks. He wants me to dismiss his child support in the next few days; however, I have not received anything from the social security office regarding their eligibility for benefits since their father was just approved. I know he has been dealing with getting approved in the last year or so.