No children on grass

When we stopped at Engen Mariental with our two children aged 2 & 5 after travelling from Windhoek. We took them to the grass area because Wimpy does not have a play area for kids. We decided to take take away and eat outside to allow the kids to run and play outside after the Wimpy waitress said we could. When we got to the grass , the security came back us saying the boss does not want people on he grass. This is the worst Engen on a main route due to this unfriendly and bad experience on our Namibian tour from Cape Town.