we would like to take our children across the park is behind tire shop and liquor store that pretty green grass, is that a part of Paco Sanchez park correct?

Take them over to 10th just east of Perry, there's a nice little playground and basketball court. And yes... got that green green grass

Yes that's part of the park, however, Right behind the tire and liquor store is not a good idea. Homeless and other's hangout there.

It is. Paco stretches from Federal past Perry all along the lightrail tracks.