Social Security & Subsidy at the same time???

We receive the SSI benefit from the children's bio. Dad for his FAS/ADHD disabilities. We were notified when we were fostering them and the state told us to go to the SS office and apply to be payees and they also sent us all the money they had already applied for and received for the children (DSHS had been holding it for them). The kids do not get a very big amount ($56/month each), but every little bit helps. It did not affect our adoption subsidy when it came up. We do currently get both.