Thanks for asking, Granny. The Worksman trike seems to do my son just fine despite his limitations, that's him pictured above. He's had a Summer of riding to the beach/convenience store/around the block and enjoyed it all. Perhaps a supervised trial on your Meridian would be in order before committing that investment for your grandson.
BTW, Worksman has a few disclaimer/info type announcements on it's website to inform everyone that delta trkes pull to the right in normal situations. Their website, worksmancycles.com, is worth a visit. They've been making trikes here in the USA since the 1800's. Their trikes are pricey, but well supported with customer info and parts inventory. I'm not an employee, or spokesperson, just a fan of well made stuff!